Improper input validation in Trellix Endpoint Hx Agent (Xagent)

CVE-2025-14963

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.001 (1.0th percentile) — read the EPSS interpretation.