CVE-2025-24052
📋 TL;DR
This CVE addresses vulnerabilities in the third-party Agere Modem driver (ltmdm64.sys) that ships with Windows. Exploitation could allow attackers to execute arbitrary code with kernel privileges. Only systems using fax modem hardware dependent on this specific driver are affected.
💻 Affected Systems
- Microsoft Windows
📦 What is this software?
Windows 10 1507 by Microsoft
Windows 10 1607 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 via kernel-level arbitrary code execution leading to persistent backdoor installation, data theft, or ransomware deployment.
Likely Case
Local privilege escalation allowing attackers to gain SYSTEM privileges on compromised systems.
If Mitigated
Minimal impact if driver is removed and no vulnerable hardware is present.
🎯 Exploit Status
Requires local access to system. No public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: October 2024 cumulative update or later
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-24052
Restart Required: Yes
Instructions:
1. Install October 2024 cumulative update via Windows Update. 2. Verify ltmdm64.sys is removed from system. 3. Remove any Agere modem hardware if present.
🔧 Temporary Workarounds
Manual driver removal
windowsRemove the vulnerable driver file from system
del /f /q C:\Windows\System32\drivers\ltmdm64.sys
sc delete ltmdm64
🧯 If You Can't Patch
- Remove Agere modem hardware from all systems
- Implement strict local privilege management and application control policies
🔍 How to Verify
Check if Vulnerable:
Check if ltmdm64.sys exists in C:\Windows\System32\drivers\Check Version:
wmic qfe list | findstr "KB"Verify Fix Applied:
Verify ltmdm64.sys is not present and October 2024 update is installed📡 Detection & Monitoring
Log Indicators:
- Driver load events for ltmdm64.sys
- Unexpected kernel-mode process creation
Network Indicators:
- Unusual modem/fax communication from systems
SIEM Query:
EventID=6 OR EventID=7 AND (DriverName="ltmdm64.sys" OR ImagePath="*ltmdm64*")