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)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.001 (1.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- Trellix Endpoint Hx Agent (Xagent) — versions 36.30.0-17, 35.31.0-37, 34.x, 33.x and 30.x
- Trellix Endpoint Security — versions 35.31.0-37, 36.30.0-17
Weakness classification (CWE)
References
- thrive.trellix.com/s/article/000015100 (Permissions Required)
Frequently asked questions
- What is CVE-2025-14963?
- CVE-2025-14963 is a high-severity vulnerability in Trellix Endpoint Hx Agent (Xagent), classified under Improper Input Validation. CVSS score: 7.8/10. Published 2026-02-24.
- How severe is CVE-2025-14963?
- High severity. CVSS v3 base score is 7.8 out of 10.