CVE-2025-53810
📋 TL;DR
This CVE describes a type confusion vulnerability in the Windows Defender Firewall Service that allows an authenticated attacker to escalate privileges locally. Attackers with initial access can exploit this to gain SYSTEM-level privileges on affected Windows systems. This affects Windows systems with the vulnerable firewall service component.
💻 Affected Systems
- Windows Defender Firewall Service
📦 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
An authenticated attacker gains SYSTEM privileges, enabling complete system compromise, persistence establishment, credential theft, and lateral movement across the network.
Likely Case
An attacker with standard user privileges escalates to SYSTEM to install malware, disable security controls, or access sensitive system resources.
If Mitigated
With proper privilege separation and least privilege principles, impact is limited to the compromised user account without SYSTEM escalation.
🎯 Exploit Status
Requires authenticated access and knowledge of type confusion exploitation techniques. No public exploit code available at this time.
🛠️ 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-2025-53810
Restart Required: No
Instructions:
1. Apply latest Windows security updates from Microsoft. 2. For enterprise environments, deploy patches via WSUS, SCCM, or Intune. 3. Verify patch installation via Windows Update history.
🔧 Temporary Workarounds
Disable Windows Defender Firewall Service
WindowsTemporarily disable the vulnerable service (not recommended for production)
sc stop mpssvc
sc config mpssvc start= disabled
🧯 If You Can't Patch
- Implement strict least privilege principles to limit initial access
- Monitor for privilege escalation attempts using Windows Event Logs and EDR solutions
🔍 How to Verify
Check if Vulnerable:
Check Windows version and patch level against Microsoft advisory. Vulnerable if running affected Windows version without security updates.Check Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify Windows Update history contains the relevant security update KB number from Microsoft advisory.📡 Detection & Monitoring
Log Indicators:
- Windows Event ID 4688 with parent process mpssvc.exe spawning unusual child processes
- Unexpected privilege escalation from standard user to SYSTEM
Network Indicators:
- Unusual outbound connections from systems shortly after privilege escalation
SIEM Query:
EventID=4688 AND ParentProcessName="mpssvc.exe" AND NewProcessName NOT IN ("svchost.exe", "services.exe")