CVE-2021-23009: F5 BIG-IP Access Policy Manager

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

On BIG-IP version 16.0.x before 16.0.1.1 and 15.1.x before 15.1.3, malformed HTTP/2 requests may cause an infinite loop which causes a Denial of Service for Data Plane traffic. TMM takes the configured HA action when the TMM process is aborted. There is no control plane exposure, this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

F5 BIG-IP Access Policy Manager: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.1 (fixed in 16.0.1.1)
F5 BIG-IP Advanced Firewall Manager: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.1 (fixed in 16.0.1.1)
F5 BIG-IP Advanced Web Application Firewall: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.1 (fixed in 16.0.1.1)
F5 BIG-IP Analytics: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.1 (fixed in 16.0.1.1)
F5 BIG-IP Application Acceleration Manager: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.1 (fixed in 16.0.1.1)
F5 BIG-IP Application Security Manager: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.1 (fixed in 16.0.1.1)
F5 BIG-IP Ddos Hybrid Defender: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.1 (fixed in 16.0.1.1)
F5 BIG-IP Domain Name System: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.1 (fixed in 16.0.1.1)
F5 BIG-IP Fraud Protection Service: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.1 (fixed in 16.0.1.1)
F5 BIG-IP Global Traffic Manager: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.1 (fixed in 16.0.1.1)
F5 BIG-IP Link Controller: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.1 (fixed in 16.0.1.1)
F5 BIG-IP Local Traffic Manager: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.1 (fixed in 16.0.1.1)
F5 BIG-IP Policy Enforcement Manager: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.1 (fixed in 16.0.1.1)
F5 BIG-IP SSL Orchestrator: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.1 (fixed in 16.0.1.1)

Published 2021-05-10. Last modified 2026-06-17.