CVE-2021-23049: 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 16.0.1.2 and 15.1.x before 15.1.3, when the iRules RESOLVER::summarize command is used on a virtual server, undisclosed requests can cause an increase in Traffic Management Microkernel (TMM) memory utilization resulting in an out-of-memory condition and a denial-of-service (DoS). 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 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Advanced Firewall Manager: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
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 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Analytics: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Application Acceleration Manager: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Application Security Manager: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Domain Name System: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Fraud Protection Service: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Global Traffic Manager: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Link Controller: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
F5 BIG-IP Local Traffic Manager: from 15.1.0, before 15.1.3 (fixed in 15.1.3); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)

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