CVE-2025-20241 (GCVE-0-2025-20241)
Vulnerability from cvelistv5 – Published: 2025-08-27 16:23 – Updated: 2025-08-27 18:18
VLAI
EPSS
VEX
Title
Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol <TBD> Denial of Service Vulnerability
Summary
A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, adjacent attacker to cause the IS-IS process to unexpectedly restart, which could cause an affected device to reload.
This vulnerability is due to insufficient input validation when parsing an ingress IS-IS packet. An attacker could exploit this vulnerability by sending a crafted IS-IS packet to an affected device. A successful exploit could allow the attacker to cause the unexpected restart of the IS-IS process, which could cause the affected device to reload, resulting in a denial of service (DoS) condition.
Note: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-08-27 18:18 UTC
CWE
- CWE-733 - Compiler Optimization Removal or Modification of Security-critical Code
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Cisco | Cisco NX-OS Software |
Affected:
9.2(3)
Affected: 7.0(3)I5(2) Affected: 6.0(2)A8(7a) Affected: 7.0(3)I4(5) Affected: 7.0(3)I4(6) Affected: 7.0(3)I4(3) Affected: 9.2(2v) Affected: 7.0(3)I4(7) Affected: 7.0(3)I4(1) Affected: 7.0(3)I4(8) Affected: 7.0(3)I4(2) Affected: 6.0(2)A8(11) Affected: 9.2(1) Affected: 9.2(2t) Affected: 9.2(3y) Affected: 7.0(3)I4(1t) Affected: 7.0(3)I7(6z) Affected: 9.3(2) Affected: 7.0(3)F3(3) Affected: 7.0(3)I7(3z) Affected: 7.0(3)IM7(2) Affected: 6.0(2)A8(11b) Affected: 7.0(3)I7(5a) Affected: 7.0(3)I6(1) Affected: 7.0(3)I5(3b) Affected: 9.2(4) Affected: 6.0(2)A8(10) Affected: 6.0(2)A8(2) Affected: 7.0(3)IC4(4) Affected: 7.0(3)F3(3c) Affected: 7.0(3)F3(1) Affected: 7.0(3)F3(5) Affected: 7.0(3)I7(2) Affected: 7.0(3)I5(3) Affected: 7.0(3)I7(3) Affected: 6.0(2)A8(6) Affected: 7.0(3)I6(2) Affected: 6.0(2)A8(5) Affected: 9.3(1) Affected: 6.0(2)A8(7) Affected: 7.0(3)I7(6) Affected: 6.0(2)A8(11a) Affected: 7.0(3)I4(8z) Affected: 7.0(3)I4(9) Affected: 7.0(3)I7(4) Affected: 7.0(3)I7(7) Affected: 6.0(2)A8(9) Affected: 6.0(2)A8(1) Affected: 6.0(2)A8(10a) Affected: 7.0(3)I5(1) Affected: 9.3(1z) Affected: 9.2(2) Affected: 7.0(3)F3(4) Affected: 7.0(3)I4(8b) Affected: 6.0(2)A8(3) Affected: 7.0(3)I4(6t) Affected: 7.0(3)I5(3a) Affected: 6.0(2)A8(8) Affected: 7.0(3)I7(5) Affected: 7.0(3)F3(3a) Affected: 6.0(2)A8(4) Affected: 7.0(3)I4(8a) Affected: 7.0(3)F3(2) Affected: 7.0(3)I4(4) Affected: 7.0(3)I7(1) Affected: 7.0(3)IA7(2) Affected: 7.0(3)IA7(1) Affected: 6.0(2)A8(7b) Affected: 6.0(2)A8(4a) Affected: 9.3(3) Affected: 7.0(3)I7(8) Affected: 9.3(4) Affected: 9.3(5) Affected: 7.0(3)I7(9) Affected: 9.3(6) Affected: 10.1(2) Affected: 10.1(1) Affected: 9.3(5w) Affected: 9.3(7) Affected: 9.3(7k) Affected: 7.0(3)I7(9w) Affected: 10.2(1) Affected: 9.3(7a) Affected: 9.3(8) Affected: 7.0(3)I7(10) Affected: 10.2(1q) Affected: 10.2(2) Affected: 9.3(9) Affected: 10.1(2t) Affected: 10.2(3) Affected: 10.2(3t) Affected: 9.3(10) Affected: 10.2(2a) Affected: 10.3(1) Affected: 10.2(4) Affected: 10.3(2) Affected: 9.3(11) Affected: 10.3(3) Affected: 10.2(5) Affected: 9.3(12) Affected: 10.2(3v) Affected: 10.4(1) Affected: 10.3(99w) Affected: 10.2(6) Affected: 10.3(3w) Affected: 10.3(99x) Affected: 10.3(3o) Affected: 10.3(4) Affected: 10.3(3p) Affected: 10.3(4a) Affected: 10.4(2) Affected: 10.3(3q) Affected: 9.3(13) Affected: 10.3(5) Affected: 10.2(7) Affected: 10.4(3) Affected: 10.3(3x) Affected: 10.3(4g) Affected: 10.5(1) Affected: 10.2(8) Affected: 10.3(3r) Affected: 10.3(6) Affected: 9.3(14) Affected: 10.4(4) Affected: 10.3(4h) Affected: 10.5(2) Affected: 10.4(4g) |
guessed |
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"value": "A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, adjacent attacker to cause the IS-IS process to unexpectedly restart, which could cause an affected device to reload.\r\n\r\nThis vulnerability is due to insufficient input validation when parsing an ingress IS-IS packet. An attacker could exploit this vulnerability by sending a crafted IS-IS packet to an affected device. A successful exploit could allow the attacker to cause the unexpected restart of the IS-IS process, which could cause the affected device to reload, resulting in a denial of service (DoS) condition.\r\nNote: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device."
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"value": "Una vulnerabilidad en la funci\u00f3n de sistema intermedio a sistema intermedio (IS-IS) del software Cisco NX-OS para los switches Cisco Nexus de las series 3000 y 9000 en modo NX-OS independiente podr\u00eda permitir que un atacante adyacente no autenticado provoque el reinicio inesperado del proceso IS-IS, lo que podr\u00eda provocar la recarga del dispositivo afectado. Esta vulnerabilidad se debe a una validaci\u00f3n de entrada insuficiente al analizar un paquete IS-IS de entrada. Un atacante podr\u00eda explotar esta vulnerabilidad enviando un paquete IS-IS manipulado a un dispositivo afectado. Una explotaci\u00f3n exitosa podr\u00eda permitir al atacante provocar el reinicio inesperado del proceso IS-IS, lo que podr\u00eda provocar la recarga del dispositivo afectado y provocar una denegaci\u00f3n de servicio (DoS). Nota: El protocolo IS-IS es un protocolo de enrutamiento. Para explotar esta vulnerabilidad, un atacante debe estar adyacente a la capa 2 del dispositivo afectado."
}
],
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"lastModified": "2026-06-17T08:41:10.377",
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"title": "Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol \u003cTBD\u003e Denial of Service Vulnerability",
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{
"lang": "en",
"value": "A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, adjacent attacker to cause the IS-IS process to unexpectedly restart, which could cause an affected device to reload.\r\n\r\nThis vulnerability is due to insufficient input validation when parsing an ingress IS-IS packet. An attacker could exploit this vulnerability by sending a crafted IS-IS packet to an affected device. A successful exploit could allow the attacker to cause the unexpected restart of the IS-IS process, which could cause the affected device to reload, resulting in a denial of service (DoS) condition.\r\nNote: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device."
}
],
"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": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-733",
"description": "Compiler Optimization Removal or Modification of Security-critical Code",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-08-27T16:23:55.242Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-n39k-isis-dos-JhJA8Rfx",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n39k-isis-dos-JhJA8Rfx"
}
],
"source": {
"advisory": "cisco-sa-n39k-isis-dos-JhJA8Rfx",
"defects": [
"CSCwn49153"
],
"discovery": "INTERNAL"
},
"title": "Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol \u003cTBD\u003e Denial of Service Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2025-20241",
"datePublished": "2025-08-27T16:23:55.242Z",
"dateReserved": "2024-10-10T19:15:13.238Z",
"dateUpdated": "2025-08-27T18:18:32.250Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
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.
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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.
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