SB2025091015 - Privilege escalation in Microsoft Windows Ancillary Function Driver for WinSock
Published: September 10, 2025
Security Bulletin ID
SB2025091015
CSH 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 vulnerability.
1) Stack-based buffer overflow (CVE-ID: CVE-2025-54099)
CWE-ID: CWE-121 - Stack-based buffer overflow
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in Windows Ancillary Function Driver for WinSock. A local user can trigger stack-based buffer overflow and gain elevated privileges on the target system.
Remediation
Install update from vendor's website.