SB2025120967 - Heap-based buffer overflow in Microsoft Win32k
Published: December 9, 2025 Updated: December 10, 2025
Security Bulletin ID
SB2025120967
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Heap-based buffer overflow (CVE-ID: CVE-2025-62458)
The vulnerability allows a local user to escalate privileges on the target system.
The vulnerability exists due to a boundary error in Win32k. A local user can pass specially crafted data to the application, trigger a heap-based buffer overflow and gain elevated privileges on the system.
Remediation
Install update from vendor's website.
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-62458
- https://www.zerodayinitiative.com/advisories/ZDI-25-1049/
- https://www.zerodayinitiative.com/advisories/ZDI-25-1048/
- https://www.zerodayinitiative.com/advisories/ZDI-25-1047/
- https://www.zerodayinitiative.com/advisories/ZDI-25-1046/