CVE-2021-23053: F5 BIG-IP Advanced Web Application Firewall

Medium severity, CVSS 5.3. EPSS: 0.9% chance of exploitation in the next 30 days.

On version 15.1.x before 15.1.3, 14.1.x before 14.1.3.1, and 13.1.x before 13.1.3.6, when the brute force protection feature of BIG-IP Advanced WAF or BIG-IP ASM is enabled on a virtual server and the virtual server is under brute force attack, the MySQL database may run out of disk space due to lack of row limit on undisclosed tables in the MYSQL database. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

• F5 BIG-IP Advanced Web Application Firewall: from 13.1.0, before 13.1.3.6 (fixed in 13.1.3.6); from 14.1.0, before 14.1.3.1 (fixed in 14.1.3.1); from 15.1.0, before 15.1.3 (fixed in 15.1.3)
• F5 BIG-IP Application Security Manager: from 13.1.0, before 13.1.3.6 (fixed in 13.1.3.6); from 14.1.0, before 14.1.3.1 (fixed in 14.1.3.1); from 15.1.0, before 15.1.3 (fixed in 15.1.3)

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