CVE-2026-40061: F5 BIG-IP Domain Name System

High severity, CVSS 8.7. EPSS: 0.4% chance of exploitation in the next 30 days.

When BIG-IP DNS is provisioned, a vulnerability exists in an undisclosed iControl REST and BIG-IP TMOS Shell (tmsh) command that may allow an authenticated attacker with the Resource Administrator or Administrator role to execute arbitrary system commands with higher privileges. In Appliance mode deployments, a successful exploit can allow the attacker to cross a security boundary.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

• F5 BIG-IP Domain Name System: from 16.1.0, up to and including 16.1.6; from 17.1.0, up to and including 17.1.3; from 17.5.0, up to and including 17.5.1; version 21.0.0 only

Published 2026-05-13. Last modified 2026-06-29.