SB2026090739 - Remote denial of service in BIG-IP DNS

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Main Vulnerability Database SB2026090739

SB2026090739 - Remote denial of service in BIG-IP DNS

Published: September 7, 2026

Security Bulletin ID SB2026090739
CSH Severity
Medium
Patch available
NO
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-12617)

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

CVSSv4: 8.7 [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]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper handling of record ordering and response content in named resolver processing when processing responses to queries for CNAME or DNAME and A records. A remote attacker can send specially crafted DNS responses to cause a denial of service.

The issue is triggered when an authoritative server returns responses in a specific order, including delayed negative DNAME replies or a delayed self-referential CNAME reply.


Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References