CVE-2025-54916
📋 TL;DR
A stack-based buffer overflow vulnerability in Windows NTFS allows authenticated attackers to execute arbitrary code locally on vulnerable systems. This affects Windows systems with NTFS file systems where an attacker has local access. The vulnerability could lead to privilege escalation or system compromise.
💻 Affected Systems
- Windows NTFS
📦 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 privileges, allowing attacker to install malware, steal data, or pivot to other systems.
Likely Case
Local privilege escalation from standard user to administrator/SYSTEM level, enabling persistence and lateral movement.
If Mitigated
Limited impact due to proper access controls, application whitelisting, and network segmentation preventing lateral movement.
🎯 Exploit Status
Requires local authenticated access. Exploit development may be complex due to stack protections like ASLR/DEP.
🛠️ 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-2025-54916
Restart Required: Yes
Instructions:
1. Apply latest Windows security updates via Windows Update. 2. For enterprise: Deploy via WSUS, SCCM, or Intune. 3. Verify patch installation with systeminfo or Get-HotFix. 4. Restart systems as required.
🔧 Temporary Workarounds
Restrict local access
windowsLimit local user accounts and implement least privilege access controls
Enable exploit mitigations
windowsEnsure ASLR, DEP, and Control Flow Guard are enabled
Check-ProcessMitigation -System
🧯 If You Can't Patch
- Implement strict access controls and least privilege principles
- Monitor for suspicious local privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check Windows version and installed updates against Microsoft advisoryCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify specific KB update is installed via systeminfo or Get-HotFix📡 Detection & Monitoring
Log Indicators:
- Event ID 4688 (process creation) with unusual parent processes
- Security log events showing privilege escalation
Network Indicators:
- Unusual lateral movement following local compromise
SIEM Query:
source="windows_security" EventID=4688 AND (ParentImage="*\cmd.exe" OR ParentImage="*\powershell.exe") AND NewProcessName="*\system32\*"