Out-of-bounds read in Windows Server and Windows - CVE-2026-20851
Published: January 13, 2026
Vulnerability identifier: #VU121242
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-20851
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows Server
Windows
Windows Server
Windows
Detailed vulnerability description
The vulnerability allows a local attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition in Capability Access Management Service (camsvc). A local attacker can trigger an out-of-bounds read error and read contents of memory on the system.
How to mitigate CVE-2026-20851
Install updates from vendor's website.