#VU121259 Use-after-free in Windows Server and Windows - CVE-2026-20854

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Main Vulnerability Database Vulnerabilities #VU121259

#VU121259 Use-after-free in Windows Server and Windows - CVE-2026-20854

Published: January 13, 2026


Vulnerability identifier: #VU121259
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-20854
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Windows Server
Windows
Software vendor:
Microsoft

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Windows Local Security Authority Subsystem Service (LSASS). A remote user can execute arbitrary code on the target system.


Remediation

Install updates from vendor's website.

External links