CVE-2021-22999: F5 BIG-IP Access Policy Manager

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

On versions 15.0.x before 15.1.0 and 14.1.x before 14.1.4, the BIG-IP system provides an option to connect HTTP/2 clients to HTTP/1.x servers. When a client is slow to accept responses and it closes a connection prematurely, the BIG-IP system may indefinitely retain some streams unclosed. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

Affected products

  • F5 BIG-IP Access Policy Manager: from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.0.0, before 15.1.0 (fixed in 15.1.0)
  • F5 BIG-IP Advanced Firewall Manager: from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.0.0, before 15.1.0 (fixed in 15.1.0)
  • F5 BIG-IP Advanced Web Application Firewall: from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.0.0, before 15.1.0 (fixed in 15.1.0)
  • F5 BIG-IP Analytics: from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.0.0, before 15.1.0 (fixed in 15.1.0)
  • F5 BIG-IP Application Acceleration Manager: from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.0.0, before 15.1.0 (fixed in 15.1.0)
  • F5 BIG-IP Application Security Manager: from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.0.0, before 15.1.0 (fixed in 15.1.0)
  • F5 BIG-IP Ddos Hybrid Defender: from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.0.0, before 15.1.0 (fixed in 15.1.0)
  • F5 BIG-IP Domain Name System: from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.0.0, before 15.1.0 (fixed in 15.1.0)
  • F5 BIG-IP Fraud Protection Service: from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.0.0, before 15.1.0 (fixed in 15.1.0)
  • F5 BIG-IP Global Traffic Manager: from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.0.0, before 15.1.0 (fixed in 15.1.0)
  • F5 BIG-IP Link Controller: from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.0.0, before 15.1.0 (fixed in 15.1.0)
  • F5 BIG-IP Local Traffic Manager: from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.0.0, before 15.1.0 (fixed in 15.1.0)
  • F5 BIG-IP Policy Enforcement Manager: from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.0.0, before 15.1.0 (fixed in 15.1.0)
  • F5 SSL Orchestrator: from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.0.0, before 15.1.0 (fixed in 15.1.0)

Published 2021-03-31. Last modified 2026-06-17.