SB2025021192 - Privilege escalation in Microsoft Windows ancillary function driver for WinSock
Published: February 11, 2025 Updated: March 10, 2025
Security Bulletin ID
SB2025021192
CSH Severity
High
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) Heap-based buffer overflow (CVE-ID: CVE-2025-21418)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
CVSSv4: 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
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in ancillary function driver for WinSock. A local user can trigger a heap-based buffer overflow and execute arbitrary code with elevated privileges.
Note, the vulnerability is being actively exploited in the wild.
Remediation
Install update from vendor's website.