CVE-2021-23035: F5 BIG-IP Access Policy Manager

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

On BIG-IP 14.1.x before 14.1.4.4, when an HTTP profile is configured on a virtual server, after a specific sequence of packets, chunked responses can cause the Traffic Management Microkernel (TMM) 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 14.1.0, up to and including 14.1.4.4
• F5 BIG-IP Advanced Firewall Manager: from 14.1.0, up to and including 14.1.4.4
• F5 BIG-IP Analytics: from 14.1.0, up to and including 14.1.4.4
• F5 BIG-IP Application Acceleration Manager: from 14.1.0, up to and including 14.1.4.4
• F5 BIG-IP Application Security Manager: from 14.1.0, up to and including 14.1.4.4
• F5 BIG-IP Domain Name System: from 14.1.0, up to and including 14.1.4.4
• F5 BIG-IP Fraud Protection Service: from 14.1.0, up to and including 14.1.4.4
• F5 BIG-IP Global Traffic Manager: from 14.1.0, up to and including 14.1.4.4
• F5 BIG-IP Link Controller: from 14.1.0, up to and including 14.1.4.4
• F5 BIG-IP Local Traffic Manager: from 14.1.0, up to and including 14.1.4.4
• F5 BIG-IP Policy Enforcement Manager: from 14.1.0, up to and including 14.1.4.4

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