Main Vulnerability Database Vulnerabilities #VU121454

#VU121454 Use-after-free in Windows Server and Windows - CVE-2026-20859

Published: January 14, 2026

Vulnerability identifier: #VU121454

Vulnerability risk: Low

CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2026-20859

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

Vulnerable software:
Windows Server
Windows

Software vendor:
Microsoft

Description

The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Windows Kernel-Mode Driver. A local user can gain elevated privileges on the target system.

Install updates from vendor's website.