#VU102617 Heap-based buffer overflow in Windows and Windows Server - CVE-2025-21333
Published: January 14, 2025 / Updated: September 12, 2025
Vulnerability identifier: #VU102617
Vulnerability risk: High
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:A/U:Amber
CVE-ID: CVE-2025-21333
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerable software:
Windows
Windows Server
Windows
Windows Server
Software vendor:
Microsoft
Microsoft
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in Windows Hyper-V NT Kernel Integration VSP component. A local user can trigger a heap-based buffer overflow and execute arbitrary code with SYSTEM privileges.
Note, the vulnerability is being actively exploited in the wild.Remediation
Install updates from vendor's website.