CVE-2025-53718
📋 TL;DR
CVE-2025-53718 is a use-after-free vulnerability in Windows Ancillary Function Driver for WinSock that allows authenticated attackers to execute arbitrary code with elevated SYSTEM privileges. This affects Windows systems where an attacker already has local access. The vulnerability enables privilege escalation from a lower-privileged account to SYSTEM level.
💻 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 where an attacker gains SYSTEM privileges, installs persistent malware, accesses sensitive data, and potentially moves laterally across the network.
Likely Case
Local privilege escalation allowing attackers to bypass security controls, install additional malware, or access protected system resources.
If Mitigated
Limited impact if proper access controls, least privilege principles, and endpoint protection are in place, though the vulnerability still presents a significant risk.
🎯 Exploit Status
Exploitation requires local authenticated access and knowledge of the vulnerable driver interface. Use-after-free vulnerabilities typically require precise timing and memory manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: To be determined via Microsoft's monthly security updates
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53718
Restart Required: Yes
Instructions:
1. Monitor Microsoft's monthly Patch Tuesday updates. 2. Apply the security update through Windows Update. 3. Restart the system as required. 4. Verify the update was successfully installed.
🔧 Temporary Workarounds
Restrict local access
windowsLimit local user access to systems through proper authentication and authorization controls
Apply least privilege
windowsEnsure users operate with minimal necessary privileges to reduce impact of successful exploitation
🧯 If You Can't Patch
- Implement strict access controls and monitor for suspicious privilege escalation attempts
- Deploy endpoint detection and response (EDR) solutions to detect exploitation behavior
🔍 How to Verify
Check if Vulnerable:
Check system against Microsoft's security update guidance for CVE-2025-53718Check Version:
wmic os get caption, version, buildnumber, csdversionVerify Fix Applied:
Verify the security update is installed via Windows Update history or system information📡 Detection & Monitoring
Log Indicators:
- Unusual process creation with SYSTEM privileges
- Suspicious driver access patterns
- Failed privilege escalation attempts
Network Indicators:
- Not applicable - local vulnerability
SIEM Query:
Process creation where parent process is low privilege and child process runs as SYSTEM