CVE-2025-62452
📋 TL;DR
A heap-based buffer overflow vulnerability in Windows Routing and Remote Access Service (RRAS) allows authenticated attackers to execute arbitrary code remotely over a network. This affects Windows systems with RRAS enabled, potentially allowing attackers to gain SYSTEM privileges on vulnerable servers. Organizations using Windows servers for routing, VPN, or remote access services are primarily affected.
💻 Affected Systems
- Windows Server
- Windows
📦 What is this software?
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 23h2 by Microsoft
Windows 11 24h2 by Microsoft
Windows 11 25h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with SYSTEM privileges, enabling persistent access, lateral movement, data exfiltration, and deployment of ransomware or other malware across the network.
Likely Case
Remote code execution leading to service disruption, credential theft, and initial foothold for further network exploitation by authenticated attackers.
If Mitigated
Limited impact due to network segmentation, strong authentication controls, and minimal RRAS usage, potentially resulting only in service crashes or denial of service.
🎯 Exploit Status
Requires authenticated network access to RRAS service. The heap-based nature suggests reliable exploitation may require specific conditions.
🛠️ 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-2025-62452
Restart Required: Yes
Instructions:
1. Apply latest Windows security updates from Microsoft
2. Specifically install the patch addressing CVE-2025-62452
3. Restart affected systems to complete installation
🔧 Temporary Workarounds
Disable RRAS Service
windowsTemporarily disable Routing and Remote Access Service if not required
sc config RemoteAccess start= disabled
net stop RemoteAccess
Network Segmentation
allRestrict network access to RRAS services using firewalls
🧯 If You Can't Patch
- Implement strict network access controls to limit RRAS exposure to only necessary trusted hosts
- Enable enhanced logging and monitoring for RRAS service activity and authentication attempts
🔍 How to Verify
Check if Vulnerable:
Check if RRAS service is running and system has not applied the security patch addressing CVE-2025-62452Check Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify Windows Update history shows successful installation of the relevant security update and RRAS service remains functional📡 Detection & Monitoring
Log Indicators:
- Unusual RRAS service crashes
- Multiple authentication failures followed by successful authentication
- Unexpected process creation from RRAS service context
Network Indicators:
- Unusual network traffic patterns to RRAS ports (typically TCP 1723 for PPTP)
- Suspicious RPC calls to RRAS service
SIEM Query:
EventID:4625 OR EventID:4688 OR Service Control Manager events showing RRAS service crashes