CVE-2021-23028: F5 BIG-IP Advanced Web Application Firewall

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

On version 16.0.x before 16.0.1.2, 15.1.x before 15.1.3.1, 14.1.x before 14.1.4.2, and 13.1.x before 13.1.4, when JSON content profiles are configured for URLs as part of an F5 Advanced Web Application Firewall (WAF)/BIG-IP ASM security policy and applied to a virtual server, undisclosed requests may cause the BIG-IP ASM 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 13.1.3.5, up to and including 13.1.3.6; from 14.1.3.1, up to and including 14.1.4.1; from 15.1.1, before 15.1.3.1 (fixed in 15.1.3.1); version 16.0.1 only
• F5 BIG-IP Application Security Manager: from 13.1..3.5, up to and including 13.1.3.6; from 14.1.3.1, up to and including 14.1.4.1; from 15.1.0, before 15.1.3.1 (fixed in 15.1.3.1); version 16.0.1 only

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