CVE-2025-55669: F5 BIG-IP Application Security Manager

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

When the BIG-IP Advanced WAF and ASM security policy and a server-side HTTP/2 profile are configured on a virtual server, undisclosed traffic 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 Application Security Manager: from 16.1.0, before 16.1.6 (fixed in 16.1.6); from 17.1.0, up to and including 17.1.2

Published 2025-10-15. Last modified 2026-10-08.