CVE-2021-23034: 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.x before 16.1.0 and 15.1.x before 15.1.3.1, when a DNS profile using a DNS cache resolver is configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) process to terminate. 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 15.1.3.1 (fixed in 15.1.3.1); from 16.0.0, before 16.1.0 (fixed in 16.1.0)
• F5 BIG-IP Advanced Firewall Manager: from 15.1.0, before 15.1.3.1 (fixed in 15.1.3.1); from 16.0.0, before 16.1.0 (fixed in 16.1.0)
• F5 BIG-IP Analytics: from 15.1.0, before 15.1.3.1 (fixed in 15.1.3.1); from 16.0.0, before 16.1.0 (fixed in 16.1.0)
• F5 BIG-IP Application Acceleration Manager: from 15.1.0, before 15.1.3.1 (fixed in 15.1.3.1); from 16.0.0, before 16.1.0 (fixed in 16.1.0)
• F5 BIG-IP Application Security Manager: from 15.1.0, before 15.1.3.1 (fixed in 15.1.3.1); from 16.0.0, before 16.1.0 (fixed in 16.1.0)
• F5 BIG-IP Domain Name System: from 15.1.0, before 15.1.3.1 (fixed in 15.1.3.1); from 16.0.0, before 16.1.0 (fixed in 16.1.0)
• F5 BIG-IP Fraud Protection Service: from 15.1.0, before 15.1.3.1 (fixed in 15.1.3.1); from 16.0.0, before 16.1.0 (fixed in 16.1.0)
• F5 BIG-IP Global Traffic Manager: from 15.1.0, before 15.1.3.1 (fixed in 15.1.3.1); from 16.0.0, before 16.1.0 (fixed in 16.1.0)
• F5 BIG-IP Link Controller: from 15.1.0, before 15.1.3.1 (fixed in 15.1.3.1); from 16.0.0, before 16.1.0 (fixed in 16.1.0)
• F5 BIG-IP Local Traffic Manager: from 15.1.0, before 15.1.3.1 (fixed in 15.1.3.1); from 16.0.0, before 16.1.0 (fixed in 16.1.0)
• F5 BIG-IP Policy Enforcement Manager: from 15.1.0, before 15.1.3.1 (fixed in 15.1.3.1); from 16.0.0, before 16.1.0 (fixed in 16.1.0)

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