CVE-2025-53134
📋 TL;DR
A race condition vulnerability in Windows Ancillary Function Driver for WinSock allows authenticated attackers to escalate privileges locally. This affects Windows systems with the vulnerable driver component. Attackers can gain higher privileges than originally granted.
💻 Affected Systems
- Microsoft Windows
📦 What is this software?
Windows 10 1507 by Microsoft
Windows 10 1507 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SYSTEM/administrator privileges, enabling installation of malware, data theft, or lateral movement across the network.
Likely Case
Local privilege escalation from standard user to administrator/SYSTEM level, allowing attackers to bypass security controls and execute arbitrary code.
If Mitigated
Limited impact if proper privilege separation and least privilege principles are enforced, though local escalation remains possible.
🎯 Exploit Status
Race conditions require precise timing and may be challenging to exploit reliably. Requires local authenticated access first.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific KB numbers
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53134
Restart Required: Yes
Instructions:
1. Apply the latest Windows security updates from Microsoft. 2. Restart the system as required. 3. Verify the patch is installed via Windows Update history or system information.
🔧 Temporary Workarounds
Restrict local access
windowsLimit who has local interactive/logon access to vulnerable systems
Apply least privilege
windowsEnsure users operate with minimal necessary privileges to reduce impact if exploited
🧯 If You Can't Patch
- Implement strict access controls and monitor for unusual privilege escalation attempts
- Segment networks to limit lateral movement if local escalation occurs
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for missing security patches related to CVE-2025-53134 or use Microsoft's security update guide.Check Version:
wmic qfe list | findstr /i "KB" or Get-Hotfix in PowerShellVerify Fix Applied:
Verify the latest Windows security updates are installed and the system has been restarted. Check that the patch KB number is present in installed updates.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation with elevated privileges
- Suspicious driver loading or modification events
- Security log events showing privilege escalation
Network Indicators:
- Not applicable - local vulnerability
SIEM Query:
EventID=4688 AND NewProcessName contains * AND SubjectUserName != SYSTEM AND TokenElevationType != %%1936