CVE-2021-23050: F5 BIG-IP Advanced Web Application Firewall

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

On BIG-IP Advanced WAF and BIG-IP ASM version 16.0.x before 16.0.1.2 and 15.1.x before 15.1.3 and NGINX App Protect on all versions before 3.5.0, when a cross-site request forgery (CSRF)-enabled policy is configured on a virtual server, an undisclosed HTML response may cause the bd 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 15.1.0, before 15.1.3.1 (fixed in 15.1.3.1); 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 15.1.3.1 (fixed in 15.1.3.1); from 16.0.0, before 16.0.1.2 (fixed in 16.0.1.2)
• F5 Nginx App Protect: from 1.0.0, up to and including 1.3.0; from 2.0.0, up to and including 2.3.0; from 3.0.0, before 3.5.0 (fixed in 3.5.0)

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