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CVE-2025-14963: A vulnerability identified in the HX Agent driver file fekern.sys allowed a threat actor with local user acces

28
Routine
HIGH 7.8UPGRADE

CVE-2025-14963 is a high-severity flaw (CVSS 7.8) affecting endpoint security. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 v

Why this priority

  • High severity

A fixed release or distro patch exists.

Risk facts

CVSS score7.8 (High)
Attack vectorLocal
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.1% (top 98%)
CISA exploited listNo
WeaknessCWE-20
Published2026-02-24
Last modified2026-06-17
Publisher (CNA): Trellix · Vendor: trellix

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Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

trellix endpoint security UPGRADE
Affected: >= 30.0.0 and <= 34.0.0 · 35.31.0-37 · 36.30.0-17
Fixed in: newer than 34.0.0
Safe to downgrade to: a release before 30.0.0
1. Check installed version
apt-cache policy endpoint-security || rpm -q endpoint-security || endpoint-security --version
2. UPGRADE to newer than 34.0.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade endpoint-security
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade endpoint-security
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 30.0.0 (Debian / Ubuntu)
apt-cache madison endpoint-security sudo apt install endpoint-security=<VERSION_BEFORE_30.0.0> sudo apt-mark hold endpoint-security
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list endpoint-security sudo dnf downgrade endpoint-security-<VERSION_BEFORE_30.0.0> sudo dnf versionlock add endpoint-security
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-14963?

endpoint security: upgrade to newer than 34.0.0. Exact commands for each OS are on this page.

Is CVE-2025-14963 being exploited?

CVE-2025-14963 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-14963 affect?

CVE-2025-14963 affects endpoint security. Severity is high (CVSS 7.8). 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

How urgent is CVE-2025-14963?

Priority 28/100. High severity

Software pages

Windows vulnerabilities

Related CVEs

References

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