CVE-2020-5929: F5 BIG-IP Access Policy Manager

Medium severity, CVSS 5.9. EPSS: 1.1% chance of exploitation in the next 30 days.

In versions 13.0.0-13.0.0 HF2, 12.1.0-12.1.2 HF1, and 11.6.1-11.6.2, BIG-IP platforms with Cavium Nitrox SSL hardware acceleration cards, a Virtual Server configured with a Client SSL profile, and using Anonymous (ADH) or Ephemeral (DHE) Diffie-Hellman key exchange and Single DH use option not enabled in the options list may be vulnerable to crafted SSL/TLS Handshakes that may result with a PMS (Pre-Master Secret) that starts in a 0 byte and may lead to a recovery of plaintext messages as BIG-IP TLS/SSL ADH/DHE sends different error messages acting as an oracle. Similar error messages when PMS starts with 0 byte coupled with very precise timing measurement observation may also expose this vulnerability.

Affected products

  • F5 BIG-IP Access Policy Manager: from 11.6.1, before 11.6.2 (fixed in 11.6.2); from 12.1.0, before 12.1.2 (fixed in 12.1.2); version 11.6.2 only; version 12.1.2 only; version 13.0.0 only
  • F5 BIG-IP Advanced Firewall Manager: from 11.6.1, before 11.6.2 (fixed in 11.6.2); from 12.1.0, before 12.1.2 (fixed in 12.1.2); version 11.6.2 only; version 12.1.2 only; version 13.0.0 only
  • F5 BIG-IP Advanced Web Application Firewall: from 11.6.1, before 11.6.2 (fixed in 11.6.2); from 12.1.0, before 12.1.2 (fixed in 12.1.2); version 11.6.2 only; version 12.1.2 only; version 13.0.0 only
  • F5 BIG-IP Analytics: from 11.6.1, before 11.6.2 (fixed in 11.6.2); from 12.1.0, before 12.1.2 (fixed in 12.1.2); version 11.6.2 only; version 12.1.2 only; version 13.0.0 only
  • F5 BIG-IP Application Acceleration Manager: from 11.6.1, before 11.6.2 (fixed in 11.6.2); from 12.1.0, before 12.1.2 (fixed in 12.1.2); version 11.6.2 only; version 12.1.2 only; version 13.0.0 only
  • F5 BIG-IP Application Security Manager: from 11.6.1, before 11.6.2 (fixed in 11.6.2); from 12.1.0, before 12.1.2 (fixed in 12.1.2); version 11.6.2 only; version 12.1.2 only; version 13.0.0 only
  • F5 BIG-IP Ddos Hybrid Defender: from 11.6.1, before 11.6.2 (fixed in 11.6.2); from 12.1.0, before 12.1.2 (fixed in 12.1.2); version 11.6.2 only; version 12.1.2 only; version 13.0.0 only
  • F5 BIG-IP Domain Name System: from 11.6.1, before 11.6.2 (fixed in 11.6.2); from 12.1.0, before 12.1.2 (fixed in 12.1.2); version 11.6.2 only; version 12.1.2 only; version 13.0.0 only
  • F5 BIG-IP Fraud Protection Service: from 11.6.1, before 11.6.2 (fixed in 11.6.2); from 12.1.0, before 12.1.2 (fixed in 12.1.2); version 11.6.2 only; version 12.1.2 only; version 13.0.0 only
  • F5 BIG-IP Global Traffic Manager: from 11.6.1, before 11.6.2 (fixed in 11.6.2); from 12.1.0, before 12.1.2 (fixed in 12.1.2); version 11.6.2 only; version 12.1.2 only; version 13.0.0 only
  • F5 BIG-IP Link Controller: from 11.6.1, before 11.6.2 (fixed in 11.6.2); from 12.1.0, before 12.1.2 (fixed in 12.1.2); version 11.6.2 only; version 12.1.2 only; version 13.0.0 only
  • F5 BIG-IP Local Traffic Manager: from 11.6.1, before 11.6.2 (fixed in 11.6.2); from 12.1.0, before 12.1.2 (fixed in 12.1.2); version 11.6.2 only; version 12.1.2 only; version 13.0.0 only
  • F5 BIG-IP Policy Enforcement Manager: from 11.6.1, before 11.6.2 (fixed in 11.6.2); from 12.1.0, before 12.1.2 (fixed in 12.1.2); version 11.6.2 only; version 12.1.2 only; version 13.0.0 only
  • F5 SSL Orchestrator: from 11.6.1, before 11.6.2 (fixed in 11.6.2); from 12.1.0, before 12.1.2 (fixed in 12.1.2); version 11.6.2 only; version 12.1.2 only; version 13.0.0 only

Published 2020-09-25. Last modified 2026-06-17.