Vulnerability-Lookup

CNVD-2026-27944

Vulnerability from cnvd - Published: 2026-07-17

Title

F5 BIG-IP DNS缓冲区溢出漏洞（CNVD-2026-27944）

Description

F5 BIG-IP是一款应用交付控制器，主要用于负载均衡、流量管理和应用安全。 F5 BIG-IP存在缓冲区溢出漏洞。该漏洞源于在虚拟服务器上配置启用DNS缓存的BIG-IP DNS配置文件时未能正确处理未公开流量，导致流量管理微内核(TMM)终止，攻击者可利用该漏洞造成服务中断。

Severity

高

Patch Name

F5 BIG-IP DNS缓冲区溢出漏洞（CNVD-2026-27944）的补丁

Patch Description

F5 BIG-IP是一款应用交付控制器，主要用于负载均衡、流量管理和应用安全。 F5 BIG-IP存在缓冲区溢出漏洞。该漏洞源于在虚拟服务器上配置启用DNS缓存的BIG-IP DNS配置文件时未能正确处理未公开流量，导致流量管理微内核(TMM)终止，攻击者可利用该漏洞造成服务中断。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://my.f5.com/manage/s/article/K000160945

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-39458

Impacted products

Name
F5 BIG-IP

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-39458",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-39458"
    }
  },
  "description": "F5 BIG-IP\u662f\u4e00\u6b3e\u5e94\u7528\u4ea4\u4ed8\u63a7\u5236\u5668\uff0c\u4e3b\u8981\u7528\u4e8e\u8d1f\u8f7d\u5747\u8861\u3001\u6d41\u91cf\u7ba1\u7406\u548c\u5e94\u7528\u5b89\u5168\u3002\n\nF5 BIG-IP\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5728\u865a\u62df\u670d\u52a1\u5668\u4e0a\u914d\u7f6e\u542f\u7528DNS\u7f13\u5b58\u7684BIG-IP DNS\u914d\u7f6e\u6587\u4ef6\u65f6\u672a\u80fd\u6b63\u786e\u5904\u7406\u672a\u516c\u5f00\u6d41\u91cf\uff0c\u5bfc\u81f4\u6d41\u91cf\u7ba1\u7406\u5fae\u5185\u6838(TMM)\u7ec8\u6b62\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u9020\u6210\u670d\u52a1\u4e2d\u65ad\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://my.f5.com/manage/s/article/K000160945",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-27944",
  "openTime": "2026-07-17",
  "patchDescription": "F5 BIG-IP\u662f\u4e00\u6b3e\u5e94\u7528\u4ea4\u4ed8\u63a7\u5236\u5668\uff0c\u4e3b\u8981\u7528\u4e8e\u8d1f\u8f7d\u5747\u8861\u3001\u6d41\u91cf\u7ba1\u7406\u548c\u5e94\u7528\u5b89\u5168\u3002\r\n\r\nF5 BIG-IP\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5728\u865a\u62df\u670d\u52a1\u5668\u4e0a\u914d\u7f6e\u542f\u7528DNS\u7f13\u5b58\u7684BIG-IP DNS\u914d\u7f6e\u6587\u4ef6\u65f6\u672a\u80fd\u6b63\u786e\u5904\u7406\u672a\u516c\u5f00\u6d41\u91cf\uff0c\u5bfc\u81f4\u6d41\u91cf\u7ba1\u7406\u5fae\u5185\u6838(TMM)\u7ec8\u6b62\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u9020\u6210\u670d\u52a1\u4e2d\u65ad\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "F5 BIG-IP DNS\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2026-27944\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "F5 BIG-IP"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-39458",
  "serverity": "\u9ad8",
  "submitTime": "2026-05-14",
  "title": "F5 BIG-IP DNS\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2026-27944\uff09"
}

CVE-2026-39458 (GCVE-0-2026-39458)

Vulnerability from cvelistv5 – Published: 2026-05-13 14:12 – Updated: 2026-08-24 21:39

Title

BIG-IP DNS Cache vulnerability

Summary

When a BIG-IP is configured with DNS caching (Such as a DNS profile with caching enabled, SSL Orchestrator, Advanced WAF DoS protection), undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Severity

7.5 (High)


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

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-13 15:57 UTC

CWE

CWE-824 - Access of Uninitialized Pointer

Assigner

f5 mitre root

References

1 reference

URL	Tags
https://my.f5.com/manage/s/article/K000160945	vendor-advisorypatch

Impacted products

1 product

Vendor	Product	Version
F5	BIG-IP	Unaffected: 21.1.0 , < * (custom) Affected: 21.0.0 , < 21.0.0.1 (custom) Affected: 17.5.0 , < 17.5.1.6 (custom) Affected: 17.1.0 , < 17.1.3.2 (custom) Affected: 16.1.0 , < * (custom)

Date Public

2026-05-13 14:00

Credits

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-39458",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-13T15:57:30.714703Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-13T16:08:30.675Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "All Modules"
          ],
          "product": "BIG-IP",
          "vendor": "F5",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "21.1.0",
              "versionType": "custom"
            },
            {
              "lessThan": "21.0.0.1",
              "status": "affected",
              "version": "21.0.0",
              "versionType": "custom"
            },
            {
              "lessThan": "17.5.1.6",
              "status": "affected",
              "version": "17.5.0",
              "versionType": "custom"
            },
            {
              "lessThan": "17.1.3.2",
              "status": "affected",
              "version": "17.1.0",
              "versionType": "custom"
            },
            {
              "lessThan": "*",
              "status": "affected",
              "version": "16.1.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "F5"
        }
      ],
      "datePublic": "2026-05-13T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eWhen a BIG-IP is configured with DNS caching  (Such as a DNS profile with caching enabled, SSL Orchestrator, Advanced WAF DoS protection), undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate.\u003c/span\u003e\u0026nbsp;Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
            }
          ],
          "value": "When a BIG-IP is configured with DNS caching  (Such as a DNS profile with caching enabled, SSL Orchestrator, Advanced WAF DoS protection), undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate.\u00a0Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-824",
              "description": "CWE-824: Access of Uninitialized Pointer",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-24T21:39:14.540Z",
        "orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
        "shortName": "f5"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://my.f5.com/manage/s/article/K000160945"
        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "title": "BIG-IP DNS Cache vulnerability",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "CHANGE_ME"
            }
          ],
          "value": "CHANGE_ME"
        }
      ],
      "x_generator": {
        "engine": "F5 SIRTBot v1.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
    "assignerShortName": "f5",
    "cveId": "CVE-2026-39458",
    "datePublished": "2026-05-13T14:12:42.079Z",
    "dateReserved": "2026-04-30T23:04:27.924Z",
    "dateUpdated": "2026-08-24T21:39:14.540Z",
    "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.