CVE-2025-64679
📋 TL;DR
A heap-based buffer overflow vulnerability in Windows Desktop Window Manager (DWM) Core Library allows authenticated attackers to execute arbitrary code with elevated SYSTEM privileges. This affects Windows systems where an attacker already has some level of access. The vulnerability enables local privilege escalation from a lower-privileged account to full system control.
💻 Affected Systems
- Windows Desktop Window Manager (DWM) Core Library
📦 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
Windows 11 25h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SYSTEM privileges, enabling installation of persistent malware, credential theft, lateral movement, and data destruction.
Likely Case
Local privilege escalation allowing attackers to bypass security controls, install additional malware, and maintain persistence on compromised systems.
If Mitigated
Limited impact if proper privilege separation, application control, and endpoint protection are in place to detect and block exploitation attempts.
🎯 Exploit Status
Requires local authenticated access. Heap manipulation requires precise control and understanding of Windows memory management.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Windows Security Update KB5037771 (or later) for affected versions
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64679
Restart Required: Yes
Instructions:
1. Open Windows Update Settings. 2. Click 'Check for updates'. 3. Install all available security updates. 4. Restart the system when prompted.
🔧 Temporary Workarounds
Restrict Local User Privileges
windowsLimit standard user accounts to prevent initial access required for exploitation
🧯 If You Can't Patch
- Implement strict application control policies to prevent unauthorized code execution
- Deploy endpoint detection and response (EDR) solutions with behavioral analysis to detect privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for KB5037771 or later. If not installed and system is within affected versions, it is vulnerable.Check Version:
wmic os get version,buildnumber,captionVerify Fix Applied:
Verify KB5037771 appears in installed updates list and system build number matches patched version.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from dwm.exe with SYSTEM privileges
- Access violations in DWM-related processes
Network Indicators:
- None - this is a local privilege escalation vulnerability
SIEM Query:
Process Creation where Parent Process Name contains 'dwm.exe' and User contains 'SYSTEM'