CVE-2020-5933: F5 BIG-IP Access Policy Manager

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

On versions 15.1.0-15.1.0.5, 14.1.0-14.1.2.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.1, when a BIG-IP system that has a virtual server configured with an HTTP compression profile processes compressed HTTP message payloads that require deflation, a Slowloris-style attack can trigger an out-of-memory condition on the BIG-IP system.

Affected products

  • F5 BIG-IP Access Policy Manager: from 11.6.1, before 11.6.5.2 (fixed in 11.6.5.2); from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 13.1.0, up to and including 13.1.3.4; from 14.1.0, before 14.1.2.4 (fixed in 14.1.2.4); from 15.1.0, before 15.1.1 (fixed in 15.1.1)
  • F5 BIG-IP Advanced Firewall Manager: from 11.6.1, before 11.6.5.2 (fixed in 11.6.5.2); from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 13.1.0, up to and including 13.1.3.4; from 14.1.0, before 14.1.2.4 (fixed in 14.1.2.4); from 15.1.0, before 15.1.1 (fixed in 15.1.1)
  • F5 BIG-IP Analytics: from 11.6.1, before 11.6.5.2 (fixed in 11.6.5.2); from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 13.1.0, up to and including 13.1.3.4; from 14.1.0, before 14.1.2.4 (fixed in 14.1.2.4); from 15.1.0, before 15.1.1 (fixed in 15.1.1)
  • F5 BIG-IP Application Acceleration Manager: from 11.6.1, before 11.6.5.2 (fixed in 11.6.5.2); from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 13.1.0, up to and including 13.1.3.4; from 14.1.0, before 14.1.2.4 (fixed in 14.1.2.4); from 15.1.0, before 15.1.1 (fixed in 15.1.1)
  • F5 BIG-IP Application Security Manager: from 11.6.1, before 11.6.5.2 (fixed in 11.6.5.2); from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 13.1.0, up to and including 13.1.3.4; from 14.1.0, before 14.1.2.4 (fixed in 14.1.2.4); from 15.1.0, before 15.1.1 (fixed in 15.1.1)
  • F5 BIG-IP Domain Name System: from 11.6.1, before 11.6.5.2 (fixed in 11.6.5.2); from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 13.1.0, up to and including 13.1.3.4; from 14.1.0, before 14.1.2.4 (fixed in 14.1.2.4); from 15.1.0, before 15.1.1 (fixed in 15.1.1)
  • F5 BIG-IP Fraud Protection Service: from 11.6.1, before 11.6.5.2 (fixed in 11.6.5.2); from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 13.1.0, up to and including 13.1.3.4; from 14.1.0, before 14.1.2.4 (fixed in 14.1.2.4); from 15.1.0, before 15.1.1 (fixed in 15.1.1)
  • F5 BIG-IP Global Traffic Manager: from 11.6.1, before 11.6.5.2 (fixed in 11.6.5.2); from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 13.1.0, up to and including 13.1.3.4; from 14.1.0, before 14.1.2.4 (fixed in 14.1.2.4); from 15.1.0, before 15.1.1 (fixed in 15.1.1)
  • F5 BIG-IP Link Controller: from 11.6.1, before 11.6.5.2 (fixed in 11.6.5.2); from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 13.1.0, up to and including 13.1.3.4; from 14.1.0, before 14.1.2.4 (fixed in 14.1.2.4); from 15.1.0, before 15.1.1 (fixed in 15.1.1)
  • F5 BIG-IP Local Traffic Manager: from 11.5.2, before 11.6.5.2 (fixed in 11.6.5.2); from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 13.1.0, up to and including 13.1.3.4; from 14.1.0, before 14.1.2.4 (fixed in 14.1.2.4); from 15.1.0, before 15.1.1 (fixed in 15.1.1)
  • F5 BIG-IP Policy Enforcement Manager: from 11.6.1, before 11.6.5.2 (fixed in 11.6.5.2); from 12.1.0, before 12.1.5.2 (fixed in 12.1.5.2); from 13.1.0, up to and including 13.1.3.4; from 14.1.0, before 14.1.2.4 (fixed in 14.1.2.4); from 15.1.0, before 15.1.1 (fixed in 15.1.1)

Published 2020-10-29. Last modified 2026-06-17.