CVE-2018-5503: F5 BIG-IP Policy Enforcement Manager

High severity, CVSS 7.5. EPSS: 1.7% chance of exploitation in the next 30 days.

On F5 BIG-IP versions 13.0.0 - 13.1.0.3 or 12.0.0 - 12.1.3.1, TMM may restart when processing a specifically crafted page through a virtual server with an associated PEM policy that has content insertion as an action.

Affected products

• F5 BIG-IP Policy Enforcement Manager: from 12.0.0, before 12.1.3.2 (fixed in 12.1.3.2); from 13.0.0, before 13.1.0.4 (fixed in 13.1.0.4)

Published 2018-03-22. Last modified 2026-06-17.