CVE-2025-48805
📋 TL;DR
A heap-based buffer overflow vulnerability in Microsoft MPEG-2 Video Extension allows authenticated attackers to execute arbitrary code locally on affected systems. This affects Windows systems with the vulnerable extension installed. Attackers need local access to exploit this vulnerability.
💻 Affected Systems
- Microsoft MPEG-2 Video Extension
📦 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
Full system compromise with attacker gaining SYSTEM privileges, installing malware, stealing credentials, and establishing persistence.
Likely Case
Local privilege escalation allowing attackers to bypass security controls, access sensitive data, or move laterally within the network.
If Mitigated
Limited impact due to proper access controls, application whitelisting, and network segmentation preventing lateral movement.
🎯 Exploit Status
Requires authenticated local access. Heap exploitation can be complex but buffer overflows are well-understood attack vectors.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Latest security update from Microsoft
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-48805
Restart Required: Yes
Instructions:
1. Apply latest Windows security updates via Windows Update. 2. For enterprise: Deploy through WSUS, Microsoft Endpoint Configuration Manager, or Microsoft Intune. 3. Verify update KB number from Microsoft advisory. 4. Restart system to complete installation.
🔧 Temporary Workarounds
Uninstall MPEG-2 Video Extension
windowsRemove the vulnerable component if not required for business operations
Get-AppxPackage Microsoft.MPEG2VideoExtension | Remove-AppxPackage
Restrict Extension Execution
windowsUse AppLocker or Windows Defender Application Control to block execution of vulnerable extension
🧯 If You Can't Patch
- Implement strict access controls and least privilege principles to limit local attack surface
- Deploy endpoint detection and response (EDR) solutions to detect exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if MPEG-2 Video Extension is installed: Get-AppxPackage Microsoft.MPEG2VideoExtensionCheck Version:
Get-AppxPackage Microsoft.MPEG2VideoExtension | Select VersionVerify Fix Applied:
Verify Windows Update history contains the relevant security update and extension version is updated📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from MPEG-2 Video Extension
- Memory allocation failures or crashes in mfmp2srcsnk.dll
Network Indicators:
- Unusual outbound connections following local exploitation
SIEM Query:
Process Creation where Image contains 'MPEG2VideoExtension' OR CommandLine contains '.mpg' OR '.mpeg' OR '.mp2'