CVE-2021-23032: F5 BIG-IP Domain Name System

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

On version 16.x before 16.1.0, 15.1.x before 15.1.3.1, 14.1.x before 14.1.4.4, and all versions of 13.1.x and 12.1.x, when a BIG-IP DNS system is configured with non-default Wide IP and pool settings, undisclosed DNS responses 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 Domain Name System: from 12.1.0, up to and including 12.1.6; from 13.1.0, up to and including 13.1.4; from 14.1.0, before 14.1.4.4 (fixed in 14.1.4.4); from 15.1.0, before 15.1.3.1 (fixed in 15.1.3.1); from 16.0.0, before 16.1.0 (fixed in 16.1.0)

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