CVE-2020-27717: F5 BIG-IP Domain Name System

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

On BIG-IP DNS 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, 13.1.0-13.1.3.4, and 12.1.0-12.1.5.2, undisclosed series of DNS requests may cause TMM to restart and generate a core file.

Affected products

• F5 BIG-IP Domain Name System: from 12.1.0, up to and including 12.1.5; from 13.1.0, before 13.1.3.5 (fixed in 13.1.3.5); from 14.1.0, before 14.1.3.1 (fixed in 14.1.3.1); from 15.0.0, before 15.1.1 (fixed in 15.1.1); from 16.0.0, before 16.0.1 (fixed in 16.0.1)

Published 2020-12-24. Last modified 2026-06-17.