CVE-2025-14963: Trellix Endpoint Security

High severity, CVSS 7.8. EPSS: 0.1% chance of exploitation in the next 30 days.

A vulnerability identified in the HX Agent driver file fekern.sys allowed a threat actor with local user access the ability to gain elevated system privileges. Utilization of a Bring Your Own Vulnerable Driver (BYOVD) was leveraged to gain access to the critical Windows process memory lsass.exe (Local Security Authority Subsystem Service). The fekern.sys is a driver file associated with the HX Agent (used in all existing HX Agent versions). The vulnerable driver installed in a product or a system running a fully functional HX Agent is, itself, not exploitable as the product’s tamper protection restricts the ability to communicate with the driver to only the Agent’s processes.

Affected products

• Trellix Endpoint Security: from 30.0.0, up to and including 34.0.0; version 35.31.0-37 only; version 36.30.0-17 only

Published 2026-02-24. Last modified 2026-06-17.