X509 certificate verification was not correctly implemented in the early access "user id" feature in the F5 BIG-IP Advanced Firewall Manager

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• f5 big-ip advanced firewall manager11.6.0 and later · up to 11.6.2 inclusive
• f5 big-ip advanced firewall manager12.1.0 and later · up to 12.1.2 inclusive
• f5 big-ip advanced firewall manager13.0.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (f5). Independent of NVD's CPE analysis and usually ahead of it.

• F5 Networks, Inc. BIG-IP AFM

  • 13.0.0, 12.1.0 - 12.1.2, 11.6.0 - 11.6.2affected

Other highest-scoring records for the same primary product.

• CVE-2022-28716On 16.1.x versions prior to 16.1.2.2, 15.1.x versions prior to 15.1.5.1, 14.1.x versions prior to 14.1.4.6, 13.1.x versions prior to 13.1.5,
  35Monitor
• CVE-2021-23040On BIG-IP AFM version 16.0.x before 16.0.1.2, 15.1.x before 15.1.3, 14.1.x before 14.1.4.2, 13.1.x before 13.1.4.1, and all versions of 12.1
  35Monitor
• CVE-2025-59478BIG-IP AFM DoS protection profile vulnerability
  34Monitor
• CVE-2025-24312BIG-IP AFM vulnerability
  34Monitor
• CVE-2019-6636On BIG-IP (AFM, ASM) 14.1.0-14.1.0.5, 14.0.0-14.0.0.4, 13.0.0-13.1.1.4, 12.1.0-12.1.4, and 11.5.1-11.6.4, a stored cross-site scripting vuln
  33Monitor
• CVE-2024-21771F5 AFM Signature Matching Vulnerability
  30Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

A certificate validation error is silently swallowed instead of terminating the connection. Often, code added for a test environment makes its way into production.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1override fun checkServerTrusted(chain: Array<X509Certificate>, type: String) {2  // Left empty for the test environment3}

1val client = OkHttpClient.Builder()2  .certificatePinner(3    CertificatePinner.Builder()4      .add("api.sirius.example", "sha256/…")5      .build()6  ).build()

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.