CVE-2021-23032

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-09-14 · updated 2026-06-17
Weakness: CWE-20

Description

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 DNS: from 12.1.0 through 12.1.6; from 13.1.0 through 13.1.4; from 14.1.0 before 14.1.4.4; from 15.1.0 before 15.1.3.1; from 16.0.0 before 16.1.0 — fixed in 14.1.4.4, 15.1.3.1, 16.1.0

How to fix

Upgrade to a fixed version: F5 BIG-IP DNS 14.1.4.4, 15.1.3.1, 16.1.0. Check the vendor advisory for mitigations.

References

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