Vulnerability-Lookup

BDU:2026-04161

Vulnerability from fstec - Published: 25.03.2026

Title

Уязвимость функции отслеживания DHCP-сообщений операционной системы Cisco IOS XE коммутаторов серии Catalyst 9000, позволяющая нарушителю выполнить произвольный код

Description

Уязвимость функции отслеживания DHCP-сообщений операционной системы Cisco IOS XE коммутаторов серии Catalyst 9000 связана с неконтролируемым расходом ресурсов. Эксплуатация уязвимости может позволить нарушителю, действующему удаленно, выполнить произвольный код путем отправки специально сформированных BOOTP-пакетов

Severity


                    
                      AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Vendor

Cisco Systems, Inc.

Software Name

Cisco IOS XE

Software Version

16.12.1 (Cisco IOS XE), 17.2.1 (Cisco IOS XE), 16.10.1 (Cisco IOS XE), 17.1.1 (Cisco IOS XE), 17.3.3 (Cisco IOS XE), 17.1.1s (Cisco IOS XE), 17.1.2 (Cisco IOS XE), 17.1.1t (Cisco IOS XE), 17.1.3 (Cisco IOS XE), 17.2.1a (Cisco IOS XE), 17.3.1 (Cisco IOS XE), 17.3.2 (Cisco IOS XE), 17.3.2a (Cisco IOS XE), 17.3.4 (Cisco IOS XE), 17.3.5 (Cisco IOS XE), 17.3.6 (Cisco IOS XE), 17.3.7 (Cisco IOS XE), 17.3.8 (Cisco IOS XE), 17.3.8a (Cisco IOS XE), 17.4.1 (Cisco IOS XE), 17.4.1c (Cisco IOS XE), 17.5.1 (Cisco IOS XE), 17.6.1 (Cisco IOS XE), 17.6.2 (Cisco IOS XE), 17.6.3 (Cisco IOS XE), 17.6.1y (Cisco IOS XE), 17.6.4 (Cisco IOS XE), 17.6.5 (Cisco IOS XE), 17.6.6 (Cisco IOS XE), 17.6.6a (Cisco IOS XE), 17.6.5a (Cisco IOS XE), 17.7.1 (Cisco IOS XE), 17.10.1 (Cisco IOS XE), 17.10.1b (Cisco IOS XE), 17.8.1 (Cisco IOS XE), 17.9.1 (Cisco IOS XE), 17.9.2 (Cisco IOS XE), 17.9.3 (Cisco IOS XE), 17.9.4 (Cisco IOS XE), 17.9.4a (Cisco IOS XE), 17.11.1 (Cisco IOS XE), 17.12.1 (Cisco IOS XE), 16.6.1 (Cisco IOS XE), 16.6.2 (Cisco IOS XE), 16.6.3 (Cisco IOS XE), 16.6.4 (Cisco IOS XE), 16.6.5 (Cisco IOS XE), 16.6.4s (Cisco IOS XE), 16.6.4a (Cisco IOS XE), 16.6.6 (Cisco IOS XE), 16.6.7 (Cisco IOS XE), 16.6.8 (Cisco IOS XE), 16.6.9 (Cisco IOS XE), 16.6.10 (Cisco IOS XE), 16.7.1 (Cisco IOS XE), 16.8.1 (Cisco IOS XE), 16.8.1a (Cisco IOS XE), 16.8.1s (Cisco IOS XE), 16.9.1 (Cisco IOS XE), 16.9.2 (Cisco IOS XE), 16.9.1s (Cisco IOS XE), 16.9.3 (Cisco IOS XE), 16.9.2s (Cisco IOS XE), 16.9.4 (Cisco IOS XE), 16.9.3s (Cisco IOS XE), 16.9.5 (Cisco IOS XE), 16.9.6 (Cisco IOS XE), 16.9.7 (Cisco IOS XE), 16.9.8 (Cisco IOS XE), 16.10.1s (Cisco IOS XE), 16.10.1e (Cisco IOS XE), 16.11.1 (Cisco IOS XE), 16.11.1b (Cisco IOS XE), 16.11.1s (Cisco IOS XE), 16.11.1c (Cisco IOS XE), 16.12.1s (Cisco IOS XE), 16.12.1c (Cisco IOS XE), 16.12.2 (Cisco IOS XE), 16.12.3 (Cisco IOS XE), 16.12.8 (Cisco IOS XE), 16.12.2s (Cisco IOS XE), 16.12.2t (Cisco IOS XE), 16.12.4 (Cisco IOS XE), 16.12.3s (Cisco IOS XE), 16.12.3a (Cisco IOS XE), 16.12.4a (Cisco IOS XE), 16.12.5 (Cisco IOS XE), 16.12.6 (Cisco IOS XE), 16.12.5b (Cisco IOS XE), 16.12.6a (Cisco IOS XE), 16.12.7 (Cisco IOS XE), 17.5.1b (Cisco IOS XE), 17.5.1c (Cisco IOS XE), 17.6.7 (Cisco IOS XE), 17.6.8 (Cisco IOS XE), 17.9.5 (Cisco IOS XE), 17.9.6 (Cisco IOS XE), 17.9.6a (Cisco IOS XE), 17.9.6b (Cisco IOS XE), 17.9.7 (Cisco IOS XE), 17.9.8 (Cisco IOS XE), 17.12.2 (Cisco IOS XE), 17.12.3 (Cisco IOS XE), 17.12.4 (Cisco IOS XE), 17.12.5 (Cisco IOS XE), 17.12.1z5 (Cisco IOS XE), 17.13.1 (Cisco IOS XE), 17.14.1 (Cisco IOS XE), 17.15.1 (Cisco IOS XE), 17.15.2 (Cisco IOS XE), 17.15.3 (Cisco IOS XE), 17.15.2b (Cisco IOS XE), 17.15.4 (Cisco IOS XE), 17.15.4b (Cisco IOS XE), 17.15.4s1 (Cisco IOS XE), 17.15.4d (Cisco IOS XE), 17.16.1 (Cisco IOS XE), 17.17.1 (Cisco IOS XE), 17.18.1 (Cisco IOS XE)

Possible Mitigations

Установка обновлений из доверенных источников. В связи со сложившейся обстановкой и введенными санкциями против Российской Федерации рекомендуется устанавливать обновления программного обеспечения только после оценки всех сопутствующих рисков. Компенсирующие меры: - настройка агента ретрансляции DHCP на игнорирование BOOTP-пакетов путем выполнения следующей команды: ip dhcp relay bootp ignore; - использование средств межсетевого экранирования для ограничения возможности удалённого доступа к программному обеспечению; - ограничение доступа к программному обеспечению, используя схему доступа по «белым спискам»; - использование SIEM-систем для отслеживания событий, связанных с обработкой BOOTP-пакетов; - ограничение доступа из внешних сетей (Интернет). Использование рекомендаций: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxA

Reference

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxA

CWE

CWE-400

JSON

To clipboard

{
  "CVSS 2.0": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
  "CVSS 3.0": "AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
  "CVSS 4.0": null,
  "remediation_\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": null,
  "remediation_\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435": null,
  "\u0412\u0435\u043d\u0434\u043e\u0440 \u041f\u041e": "Cisco Systems, Inc.",
  "\u0412\u0435\u0440\u0441\u0438\u044f \u041f\u041e": "16.12.1 (Cisco IOS XE), 17.2.1 (Cisco IOS XE), 16.10.1 (Cisco IOS XE), 17.1.1 (Cisco IOS XE), 17.3.3 (Cisco IOS XE), 17.1.1s (Cisco IOS XE), 17.1.2 (Cisco IOS XE), 17.1.1t (Cisco IOS XE), 17.1.3 (Cisco IOS XE), 17.2.1a (Cisco IOS XE), 17.3.1 (Cisco IOS XE), 17.3.2 (Cisco IOS XE), 17.3.2a (Cisco IOS XE), 17.3.4 (Cisco IOS XE), 17.3.5 (Cisco IOS XE), 17.3.6 (Cisco IOS XE), 17.3.7 (Cisco IOS XE), 17.3.8 (Cisco IOS XE), 17.3.8a (Cisco IOS XE), 17.4.1 (Cisco IOS XE), 17.4.1c (Cisco IOS XE), 17.5.1 (Cisco IOS XE), 17.6.1 (Cisco IOS XE), 17.6.2 (Cisco IOS XE), 17.6.3 (Cisco IOS XE), 17.6.1y (Cisco IOS XE), 17.6.4 (Cisco IOS XE), 17.6.5 (Cisco IOS XE), 17.6.6 (Cisco IOS XE), 17.6.6a (Cisco IOS XE), 17.6.5a (Cisco IOS XE), 17.7.1 (Cisco IOS XE), 17.10.1 (Cisco IOS XE), 17.10.1b (Cisco IOS XE), 17.8.1 (Cisco IOS XE), 17.9.1 (Cisco IOS XE), 17.9.2 (Cisco IOS XE), 17.9.3 (Cisco IOS XE), 17.9.4 (Cisco IOS XE), 17.9.4a (Cisco IOS XE), 17.11.1 (Cisco IOS XE), 17.12.1 (Cisco IOS XE), 16.6.1 (Cisco IOS XE), 16.6.2 (Cisco IOS XE), 16.6.3 (Cisco IOS XE), 16.6.4 (Cisco IOS XE), 16.6.5 (Cisco IOS XE), 16.6.4s (Cisco IOS XE), 16.6.4a (Cisco IOS XE), 16.6.6 (Cisco IOS XE), 16.6.7 (Cisco IOS XE), 16.6.8 (Cisco IOS XE), 16.6.9 (Cisco IOS XE), 16.6.10 (Cisco IOS XE), 16.7.1 (Cisco IOS XE), 16.8.1 (Cisco IOS XE), 16.8.1a (Cisco IOS XE), 16.8.1s (Cisco IOS XE), 16.9.1 (Cisco IOS XE), 16.9.2 (Cisco IOS XE), 16.9.1s (Cisco IOS XE), 16.9.3 (Cisco IOS XE), 16.9.2s (Cisco IOS XE), 16.9.4 (Cisco IOS XE), 16.9.3s (Cisco IOS XE), 16.9.5 (Cisco IOS XE), 16.9.6 (Cisco IOS XE), 16.9.7 (Cisco IOS XE), 16.9.8 (Cisco IOS XE), 16.10.1s (Cisco IOS XE), 16.10.1e (Cisco IOS XE), 16.11.1 (Cisco IOS XE), 16.11.1b (Cisco IOS XE), 16.11.1s (Cisco IOS XE), 16.11.1c (Cisco IOS XE), 16.12.1s (Cisco IOS XE), 16.12.1c (Cisco IOS XE), 16.12.2 (Cisco IOS XE), 16.12.3 (Cisco IOS XE), 16.12.8 (Cisco IOS XE), 16.12.2s (Cisco IOS XE), 16.12.2t (Cisco IOS XE), 16.12.4 (Cisco IOS XE), 16.12.3s (Cisco IOS XE), 16.12.3a (Cisco IOS XE), 16.12.4a (Cisco IOS XE), 16.12.5 (Cisco IOS XE), 16.12.6 (Cisco IOS XE), 16.12.5b (Cisco IOS XE), 16.12.6a (Cisco IOS XE), 16.12.7 (Cisco IOS XE), 17.5.1b (Cisco IOS XE), 17.5.1c (Cisco IOS XE), 17.6.7 (Cisco IOS XE), 17.6.8 (Cisco IOS XE), 17.9.5 (Cisco IOS XE), 17.9.6 (Cisco IOS XE), 17.9.6a (Cisco IOS XE), 17.9.6b (Cisco IOS XE), 17.9.7 (Cisco IOS XE), 17.9.8 (Cisco IOS XE), 17.12.2 (Cisco IOS XE), 17.12.3 (Cisco IOS XE), 17.12.4 (Cisco IOS XE), 17.12.5 (Cisco IOS XE), 17.12.1z5 (Cisco IOS XE), 17.13.1 (Cisco IOS XE), 17.14.1 (Cisco IOS XE), 17.15.1 (Cisco IOS XE), 17.15.2 (Cisco IOS XE), 17.15.3 (Cisco IOS XE), 17.15.2b (Cisco IOS XE), 17.15.4 (Cisco IOS XE), 17.15.4b (Cisco IOS XE), 17.15.4s1 (Cisco IOS XE), 17.15.4d (Cisco IOS XE), 17.16.1 (Cisco IOS XE), 17.17.1 (Cisco IOS XE), 17.18.1 (Cisco IOS XE)",
  "\u0412\u043e\u0437\u043c\u043e\u0436\u043d\u044b\u0435 \u043c\u0435\u0440\u044b \u043f\u043e \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044e": "\u0423\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0439 \u0438\u0437 \u0434\u043e\u0432\u0435\u0440\u0435\u043d\u043d\u044b\u0445 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u043e\u0432. \u0412 \u0441\u0432\u044f\u0437\u0438 \u0441\u043e \u0441\u043b\u043e\u0436\u0438\u0432\u0448\u0435\u0439\u0441\u044f \u043e\u0431\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u043e\u0439 \u0438 \u0432\u0432\u0435\u0434\u0435\u043d\u043d\u044b\u043c\u0438 \u0441\u0430\u043d\u043a\u0446\u0438\u044f\u043c\u0438 \u043f\u0440\u043e\u0442\u0438\u0432 \u0420\u043e\u0441\u0441\u0438\u0439\u0441\u043a\u043e\u0439 \u0424\u0435\u0434\u0435\u0440\u0430\u0446\u0438\u0438 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0443\u0435\u0442\u0441\u044f \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0442\u044c \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u043e\u0441\u043b\u0435 \u043e\u0446\u0435\u043d\u043a\u0438 \u0432\u0441\u0435\u0445 \u0441\u043e\u043f\u0443\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0445 \u0440\u0438\u0441\u043a\u043e\u0432.\n\n\u041a\u043e\u043c\u043f\u0435\u043d\u0441\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u043c\u0435\u0440\u044b:\n- \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430 \u0430\u0433\u0435\u043d\u0442\u0430 \u0440\u0435\u0442\u0440\u0430\u043d\u0441\u043b\u044f\u0446\u0438\u0438 DHCP \u043d\u0430 \u0438\u0433\u043d\u043e\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 BOOTP-\u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u043f\u0443\u0442\u0435\u043c \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u043a\u043e\u043c\u0430\u043d\u0434\u044b: ip dhcp relay bootp ignore;\n- \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0441\u0440\u0435\u0434\u0441\u0442\u0432 \u043c\u0435\u0436\u0441\u0435\u0442\u0435\u0432\u043e\u0433\u043e \u044d\u043a\u0440\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0434\u043b\u044f \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u043c\u0443 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044e;\n- \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u043c\u0443 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044e, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f \u0441\u0445\u0435\u043c\u0443 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043f\u043e \u00ab\u0431\u0435\u043b\u044b\u043c \u0441\u043f\u0438\u0441\u043a\u0430\u043c\u00bb;\n- \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 SIEM-\u0441\u0438\u0441\u0442\u0435\u043c \u0434\u043b\u044f \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u044f \u0441\u043e\u0431\u044b\u0442\u0438\u0439, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0445 \u0441 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 BOOTP-\u043f\u0430\u043a\u0435\u0442\u043e\u0432;\n- \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u0438\u0437 \u0432\u043d\u0435\u0448\u043d\u0438\u0445 \u0441\u0435\u0442\u0435\u0439 (\u0418\u043d\u0442\u0435\u0440\u043d\u0435\u0442).\n\n\u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0439:\nhttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxA",
  "\u0414\u0430\u0442\u0430 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u044f": "25.03.2026",
  "\u0414\u0430\u0442\u0430 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0433\u043e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f": "30.03.2026",
  "\u0414\u0430\u0442\u0430 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438": "30.03.2026",
  "\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": "BDU:2026-04161",
  "\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u044b \u0434\u0440\u0443\u0433\u0438\u0445 \u0441\u0438\u0441\u0442\u0435\u043c \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "CVE-2026-20084",
  "\u0418\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430",
  "\u041a\u043b\u0430\u0441\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043a\u043e\u0434\u0430",
  "\u041d\u0430\u0437\u0432\u0430\u043d\u0438\u0435 \u041f\u041e": "Cisco IOS XE",
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u041e\u0421 \u0438 \u0442\u0438\u043f \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0439 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b": "Cisco Systems, Inc. Cisco IOS XE 16.12.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.2.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.10.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.1.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.3.3 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.1.1s Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.1.2 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.1.1t Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.1.3 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.2.1a Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.3.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.3.2 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.3.2a Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.3.4 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.3.5 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.3.6 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.3.7 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.3.8 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.3.8a Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.4.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.4.1c Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.5.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.6.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.6.2 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.6.3 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.6.1y Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.6.4 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.6.5 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.6.6 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.6.6a Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.6.5a Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.7.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.10.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.10.1b Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.8.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.9.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.9.2 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.9.3 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.9.4 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.9.4a Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.11.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.12.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.6.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.6.2 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.6.3 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.6.4 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.6.5 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.6.4s Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.6.4a Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.6.6 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.6.7 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.6.8 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.6.9 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.6.10 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.7.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.8.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.8.1a Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.8.1s Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.9.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.9.2 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.9.1s Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.9.3 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.9.2s Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.9.4 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.9.3s Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.9.5 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.9.6 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.9.7 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.9.8 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.10.1s Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.10.1e Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.11.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.11.1b Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.11.1s Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.11.1c Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.1s Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.1c Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.2 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.3 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.8 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.2s Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.2t Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.4 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.3s Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.3a Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.4a Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.5 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.6 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.5b Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.6a Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 16.12.7 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.5.1b Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.5.1c Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.6.7 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.6.8 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.9.5 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.9.6 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.9.6a Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.9.6b Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.9.7 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.9.8 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.12.2 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.12.3 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.12.4 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.12.5 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.12.1z5 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.13.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.14.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.15.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.15.2 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.15.3 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.15.2b Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.15.4 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.15.4b Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.15.4s1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.15.4d Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.16.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.17.1 Catalyst 9000 Series, Cisco Systems, Inc. Cisco IOS XE 17.18.1 Catalyst 9000 Series",
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u044f DHCP-\u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b Cisco IOS XE \u043a\u043e\u043c\u043c\u0443\u0442\u0430\u0442\u043e\u0440\u043e\u0432 \u0441\u0435\u0440\u0438\u0438 Catalyst 9000, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0439 \u043a\u043e\u0434",
  "\u041d\u0430\u043b\u0438\u0447\u0438\u0435 \u044d\u043a\u0441\u043f\u043b\u043e\u0439\u0442\u0430": "\u0414\u0430\u043d\u043d\u044b\u0435 \u0443\u0442\u043e\u0447\u043d\u044f\u044e\u0442\u0441\u044f",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "\u041d\u0435\u043a\u043e\u043d\u0442\u0440\u043e\u043b\u0438\u0440\u0443\u0435\u043c\u044b\u0439 \u0440\u0430\u0441\u0445\u043e\u0434 \u0440\u0435\u0441\u0443\u0440\u0441\u0430 (\u00ab\u0418\u0441\u0442\u043e\u0449\u0435\u043d\u0438\u0435 \u0440\u0435\u0441\u0443\u0440\u0441\u0430\u00bb) (CWE-400)",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u044f DHCP-\u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b Cisco IOS XE \u043a\u043e\u043c\u043c\u0443\u0442\u0430\u0442\u043e\u0440\u043e\u0432 \u0441\u0435\u0440\u0438\u0438 Catalyst 9000 \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 \u043d\u0435\u043a\u043e\u043d\u0442\u0440\u043e\u043b\u0438\u0440\u0443\u0435\u043c\u044b\u043c \u0440\u0430\u0441\u0445\u043e\u0434\u043e\u043c \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432. \u042d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442\u044c \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e, \u0434\u0435\u0439\u0441\u0442\u0432\u0443\u044e\u0449\u0435\u043c\u0443 \u0443\u0434\u0430\u043b\u0435\u043d\u043d\u043e, \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0439 \u043a\u043e\u0434 \u043f\u0443\u0442\u0435\u043c \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0441\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 BOOTP-\u043f\u0430\u043a\u0435\u0442\u043e\u0432",
  "\u041f\u043e\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u044f \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": null,
  "\u041f\u0440\u043e\u0447\u0430\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f": null,
  "\u0421\u0432\u044f\u0437\u044c \u0441 \u0438\u043d\u0446\u0438\u0434\u0435\u043d\u0442\u0430\u043c\u0438 \u0418\u0411": "\u0414\u0430\u043d\u043d\u044b\u0435 \u0443\u0442\u043e\u0447\u043d\u044f\u044e\u0442\u0441\u044f",
  "\u0421\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044f": "\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438": "\u0418\u0441\u0447\u0435\u0440\u043f\u0430\u043d\u0438\u0435 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432",
  "\u0421\u0441\u044b\u043b\u043a\u0438 \u043d\u0430 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u0438": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxA",
  "\u0421\u0442\u0430\u0442\u0443\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u0435\u043c",
  "\u0422\u0438\u043f \u041f\u041e": "\u041e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u0430\u044f \u0441\u0438\u0441\u0442\u0435\u043c\u0430, \u041f\u041e \u0441\u0435\u0442\u0435\u0432\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e-\u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0433\u043e \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0430",
  "\u0422\u0438\u043f \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "CWE-400",
  "\u0423\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0412\u044b\u0441\u043e\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 2.0 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 7,8)\n\u0412\u044b\u0441\u043e\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 3.1 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 8,6)"
}

CVE-2026-20084 (GCVE-0-2026-20084)

Vulnerability from cvelistv5 – Published: 2026-03-25 16:02 – Updated: 2026-03-26 17:35

Summary

A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets. There are workarounds that address this vulnerability.

Severity

8.6 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-26 17:35 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

cisco mitre root

References

1 reference

URL	Tags
https://sec.cloudapps.cisco.com/security/center/c…

Impacted products

1 product

Vendor	Product	Version
Cisco	Cisco IOS XE Software	Affected: 16.6.1 Affected: 16.6.2 Affected: 16.6.3 Affected: 16.6.4 Affected: 16.6.5 Affected: 16.6.4a Affected: 16.6.6 Affected: 16.6.7 Affected: 16.6.8 Affected: 16.6.9 Affected: 16.6.10 Affected: 16.7.1 Affected: 16.8.1 Affected: 16.8.1a Affected: 16.8.1s Affected: 16.9.1 Affected: 16.9.2 Affected: 16.9.1s Affected: 16.9.3 Affected: 16.9.4 Affected: 16.9.5 Affected: 16.9.6 Affected: 16.9.7 Affected: 16.9.8 Affected: 16.10.1 Affected: 16.10.1s Affected: 16.10.1e Affected: 16.11.1 Affected: 16.11.1b Affected: 16.11.1s Affected: 16.12.1 Affected: 16.12.1s Affected: 16.12.1c Affected: 16.12.2 Affected: 16.12.3 Affected: 16.12.8 Affected: 16.12.2s Affected: 16.12.4 Affected: 16.12.3s Affected: 16.12.3a Affected: 16.12.4a Affected: 16.12.5 Affected: 16.12.6 Affected: 16.12.5b Affected: 16.12.6a Affected: 16.12.7 Affected: 17.1.1 Affected: 17.1.1s Affected: 17.1.1t Affected: 17.1.3 Affected: 17.2.1 Affected: 17.2.1a Affected: 17.3.1 Affected: 17.3.2 Affected: 17.3.3 Affected: 17.3.2a Affected: 17.3.4 Affected: 17.3.5 Affected: 17.3.6 Affected: 17.3.7 Affected: 17.3.8 Affected: 17.3.8a Affected: 17.4.1 Affected: 17.5.1 Affected: 17.6.1 Affected: 17.6.2 Affected: 17.6.3 Affected: 17.6.1y Affected: 17.6.4 Affected: 17.6.5 Affected: 17.6.6 Affected: 17.6.6a Affected: 17.6.5a Affected: 17.6.7 Affected: 17.6.8 Affected: 17.7.1 Affected: 17.10.1 Affected: 17.10.1b Affected: 17.8.1 Affected: 17.9.1 Affected: 17.9.2 Affected: 17.9.3 Affected: 17.9.4 Affected: 17.9.5 Affected: 17.9.4a Affected: 17.9.6 Affected: 17.9.6a Affected: 17.9.7 Affected: 17.9.8 Affected: 17.11.1 Affected: 17.12.1 Affected: 17.12.2 Affected: 17.12.3 Affected: 17.12.4 Affected: 17.12.5 Affected: 17.12.1z5 Affected: 17.13.1 Affected: 17.14.1 Affected: 17.15.1 Affected: 17.15.2 Affected: 17.15.3 Affected: 17.15.2b Affected: 17.15.4 Affected: 17.15.4d Affected: 17.16.1 Affected: 17.17.1 Affected: 17.18.1

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-20084",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-26T17:35:41.843290Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-26T17:35:50.008Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Cisco IOS XE Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "16.6.1"
            },
            {
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              "version": "16.6.2"
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              "status": "affected",
              "version": "16.6.3"
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            {
              "status": "affected",
              "version": "16.6.4"
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            {
              "status": "affected",
              "version": "16.6.5"
            },
            {
              "status": "affected",
              "version": "16.6.4a"
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            {
              "status": "affected",
              "version": "16.6.6"
            },
            {
              "status": "affected",
              "version": "16.6.7"
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            {
              "status": "affected",
              "version": "16.6.8"
            },
            {
              "status": "affected",
              "version": "16.6.9"
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            {
              "status": "affected",
              "version": "16.6.10"
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            {
              "status": "affected",
              "version": "16.7.1"
            },
            {
              "status": "affected",
              "version": "16.8.1"
            },
            {
              "status": "affected",
              "version": "16.8.1a"
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            {
              "status": "affected",
              "version": "16.8.1s"
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            {
              "status": "affected",
              "version": "16.9.1"
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            {
              "status": "affected",
              "version": "16.9.2"
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            {
              "status": "affected",
              "version": "16.9.1s"
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            {
              "status": "affected",
              "version": "16.9.3"
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            {
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            {
              "status": "affected",
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            {
              "status": "affected",
              "version": "16.9.6"
            },
            {
              "status": "affected",
              "version": "16.9.7"
            },
            {
              "status": "affected",
              "version": "16.9.8"
            },
            {
              "status": "affected",
              "version": "16.10.1"
            },
            {
              "status": "affected",
              "version": "16.10.1s"
            },
            {
              "status": "affected",
              "version": "16.10.1e"
            },
            {
              "status": "affected",
              "version": "16.11.1"
            },
            {
              "status": "affected",
              "version": "16.11.1b"
            },
            {
              "status": "affected",
              "version": "16.11.1s"
            },
            {
              "status": "affected",
              "version": "16.12.1"
            },
            {
              "status": "affected",
              "version": "16.12.1s"
            },
            {
              "status": "affected",
              "version": "16.12.1c"
            },
            {
              "status": "affected",
              "version": "16.12.2"
            },
            {
              "status": "affected",
              "version": "16.12.3"
            },
            {
              "status": "affected",
              "version": "16.12.8"
            },
            {
              "status": "affected",
              "version": "16.12.2s"
            },
            {
              "status": "affected",
              "version": "16.12.4"
            },
            {
              "status": "affected",
              "version": "16.12.3s"
            },
            {
              "status": "affected",
              "version": "16.12.3a"
            },
            {
              "status": "affected",
              "version": "16.12.4a"
            },
            {
              "status": "affected",
              "version": "16.12.5"
            },
            {
              "status": "affected",
              "version": "16.12.6"
            },
            {
              "status": "affected",
              "version": "16.12.5b"
            },
            {
              "status": "affected",
              "version": "16.12.6a"
            },
            {
              "status": "affected",
              "version": "16.12.7"
            },
            {
              "status": "affected",
              "version": "17.1.1"
            },
            {
              "status": "affected",
              "version": "17.1.1s"
            },
            {
              "status": "affected",
              "version": "17.1.1t"
            },
            {
              "status": "affected",
              "version": "17.1.3"
            },
            {
              "status": "affected",
              "version": "17.2.1"
            },
            {
              "status": "affected",
              "version": "17.2.1a"
            },
            {
              "status": "affected",
              "version": "17.3.1"
            },
            {
              "status": "affected",
              "version": "17.3.2"
            },
            {
              "status": "affected",
              "version": "17.3.3"
            },
            {
              "status": "affected",
              "version": "17.3.2a"
            },
            {
              "status": "affected",
              "version": "17.3.4"
            },
            {
              "status": "affected",
              "version": "17.3.5"
            },
            {
              "status": "affected",
              "version": "17.3.6"
            },
            {
              "status": "affected",
              "version": "17.3.7"
            },
            {
              "status": "affected",
              "version": "17.3.8"
            },
            {
              "status": "affected",
              "version": "17.3.8a"
            },
            {
              "status": "affected",
              "version": "17.4.1"
            },
            {
              "status": "affected",
              "version": "17.5.1"
            },
            {
              "status": "affected",
              "version": "17.6.1"
            },
            {
              "status": "affected",
              "version": "17.6.2"
            },
            {
              "status": "affected",
              "version": "17.6.3"
            },
            {
              "status": "affected",
              "version": "17.6.1y"
            },
            {
              "status": "affected",
              "version": "17.6.4"
            },
            {
              "status": "affected",
              "version": "17.6.5"
            },
            {
              "status": "affected",
              "version": "17.6.6"
            },
            {
              "status": "affected",
              "version": "17.6.6a"
            },
            {
              "status": "affected",
              "version": "17.6.5a"
            },
            {
              "status": "affected",
              "version": "17.6.7"
            },
            {
              "status": "affected",
              "version": "17.6.8"
            },
            {
              "status": "affected",
              "version": "17.7.1"
            },
            {
              "status": "affected",
              "version": "17.10.1"
            },
            {
              "status": "affected",
              "version": "17.10.1b"
            },
            {
              "status": "affected",
              "version": "17.8.1"
            },
            {
              "status": "affected",
              "version": "17.9.1"
            },
            {
              "status": "affected",
              "version": "17.9.2"
            },
            {
              "status": "affected",
              "version": "17.9.3"
            },
            {
              "status": "affected",
              "version": "17.9.4"
            },
            {
              "status": "affected",
              "version": "17.9.5"
            },
            {
              "status": "affected",
              "version": "17.9.4a"
            },
            {
              "status": "affected",
              "version": "17.9.6"
            },
            {
              "status": "affected",
              "version": "17.9.6a"
            },
            {
              "status": "affected",
              "version": "17.9.7"
            },
            {
              "status": "affected",
              "version": "17.9.8"
            },
            {
              "status": "affected",
              "version": "17.11.1"
            },
            {
              "status": "affected",
              "version": "17.12.1"
            },
            {
              "status": "affected",
              "version": "17.12.2"
            },
            {
              "status": "affected",
              "version": "17.12.3"
            },
            {
              "status": "affected",
              "version": "17.12.4"
            },
            {
              "status": "affected",
              "version": "17.12.5"
            },
            {
              "status": "affected",
              "version": "17.12.1z5"
            },
            {
              "status": "affected",
              "version": "17.13.1"
            },
            {
              "status": "affected",
              "version": "17.14.1"
            },
            {
              "status": "affected",
              "version": "17.15.1"
            },
            {
              "status": "affected",
              "version": "17.15.2"
            },
            {
              "status": "affected",
              "version": "17.15.3"
            },
            {
              "status": "affected",
              "version": "17.15.2b"
            },
            {
              "status": "affected",
              "version": "17.15.4"
            },
            {
              "status": "affected",
              "version": "17.15.4d"
            },
            {
              "status": "affected",
              "version": "17.16.1"
            },
            {
              "status": "affected",
              "version": "17.17.1"
            },
            {
              "status": "affected",
              "version": "17.18.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. \r\n\r This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. \r\n\r Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.\r\n\r   There are workarounds that address this vulnerability."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "cvssV3_1"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "cwe"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T16:02:39.119Z",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "cisco-sa-bootp-WuBhNBxA",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxA"
        }
      ],
      "source": {
        "advisory": "cisco-sa-bootp-WuBhNBxA",
        "defects": [
          "CSCwq07617"
        ],
        "discovery": "EXTERNAL"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2026-20084",
    "datePublished": "2026-03-25T16:02:39.119Z",
    "dateReserved": "2025-10-08T11:59:15.366Z",
    "dateUpdated": "2026-03-26T17:35:50.008Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.