Heap-based buffer overflow in Windows and Windows Server - CVE-2025-26634
Published: April 28, 2025
Vulnerability identifier: #VU107993
CSH Severity: Medium
CVSS v4.0: 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-2025-26634
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows
Windows Server
Windows
Windows Server
Detailed vulnerability description
The vulnerability allows a remote user to escalate privileges on the system.
The vulnerability exists due to a boundary error in Windows Core Messaging. A remote user can send a specially crafted request to the system, trigger a heap-based buffer overflow and execute arbitrary code with SYSTEM privileges.
How to mitigate CVE-2025-26634
Install updates from vendor's website.