CVE-2021-23042: F5 BIG-IP Access Policy Manager

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

On BIG-IP version 16.0.x before 16.0.1.2, 15.1.x before 15.1.3, 14.1.x before 14.1.4, 13.1.x before 13.1.4, and 12.1.x before 12.1.6, when an HTTP profile is configured on a virtual server, undisclosed requests can cause a significant increase in system resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

F5 BIG-IP Access Policy Manager: from 12.1.0, before 12.1.6 (fixed in 12.1.6); from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Advanced Firewall Manager: from 12.1.0, before 12.1.6 (fixed in 12.1.6); from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Advanced Web Application Firewall: from 12.1.0, before 12.1.6 (fixed in 12.1.6); from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Analytics: from 12.1.0, before 12.1.6 (fixed in 12.1.6); from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Application Acceleration Manager: from 12.1.0, before 12.1.6 (fixed in 12.1.6); from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Application Security Manager: from 12.1.0, before 12.1.6 (fixed in 12.1.6); from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Ddos Hybrid Defender: from 12.1.0, before 12.1.6 (fixed in 12.1.6); from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Domain Name System: from 12.1.0, before 12.1.6 (fixed in 12.1.6); from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Fraud Protection Service: from 12.1.0, before 12.1.6 (fixed in 12.1.6); from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Global Traffic Manager: from 12.1.0, before 12.1.6 (fixed in 12.1.6); from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Link Controller: from 12.1.0, before 12.1.6 (fixed in 12.1.6); from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Local Traffic Manager: from 12.1.0, before 12.1.6 (fixed in 12.1.6); from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Policy Enforcement Manager: from 12.1.0, before 12.1.6 (fixed in 12.1.6); from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP SSL Orchestrator: from 12.1.0, before 12.1.6 (fixed in 12.1.6); from 13.1.0, before 13.1.4 (fixed in 13.1.4); from 14.1.0, before 14.1.4 (fixed in 14.1.4); from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)

Published 2021-09-14. Last modified 2026-06-17.