CVE-2026-41227: F5 BIG-IP Advanced Web Application Firewall

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

On an HTTP/2 virtual server with Layer 7 DoS Protection configured, undisclosed traffic can result in an increase in memory consumption causing 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 Advanced Web Application Firewall: from 17.1.0, up to and including 17.1.3; from 17.5.0, up to and including 17.5.1; from 16.1.0, up to and including 16.1.6
• F5 BIG-IP Application Security Manager: from 17.1.0, up to and including 17.1.3; from 17.5.0, up to and including 17.5.1; from 16.1.0, up to and including 16.1.6
• F5 BIG-IP Ddos Hybrid Defender: from 17.1.0, up to and including 17.1.3; from 17.5.0, up to and including 17.5.1; from 16.1.0, up to and including 16.1.6

Published 2026-05-13. Last modified 2026-06-24.