CVE-2025-49671
📋 TL;DR
This vulnerability in Windows Routing and Remote Access Service (RRAS) allows unauthorized network attackers to access sensitive information. It affects Windows systems with RRAS enabled, potentially exposing configuration data or credentials to attackers on the same network segment.
💻 Affected Systems
- Windows Routing and Remote Access Service
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could obtain administrative credentials or sensitive network configuration data, leading to lateral movement, privilege escalation, or complete network compromise.
Likely Case
Unauthorized disclosure of RRAS configuration details, connection logs, or partial credential information that could aid further attacks.
If Mitigated
Limited information disclosure with minimal impact if proper network segmentation and access controls are implemented.
🎯 Exploit Status
Based on CVSS vector and description, exploitation appears to be network-accessible without authentication.
🛠️ 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-2025-49671
Restart Required: Yes
Instructions:
1. Apply latest Windows security updates via Windows Update
2. For enterprise: Deploy through WSUS or Microsoft Endpoint Configuration Manager
3. Restart affected systems after patch installation
🔧 Temporary Workarounds
Disable RRAS if not required
windowsTurn off Routing and Remote Access Service on systems where it's not needed
sc config RemoteAccess start= disabled
net stop RemoteAccess
Network segmentation
allIsolate RRAS servers from untrusted networks using firewalls or network segmentation
🧯 If You Can't Patch
- Implement strict network access controls to limit which systems can communicate with RRAS servers
- Monitor RRAS service logs for unusual access patterns or information disclosure attempts
🔍 How to Verify
Check if Vulnerable:
Check if RRAS service is running: 'sc query RemoteAccess' and verify Windows version is unpatchedCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify Windows Update history for relevant security patches and confirm RRAS service version after update📡 Detection & Monitoring
Log Indicators:
- Unusual network connections to RRAS service ports (TCP 1723, UDP 1701)
- RRAS service access from unauthorized IP addresses
- Increased error or access logs in RRAS event logs
Network Indicators:
- Unexpected traffic to RRAS ports from non-standard sources
- Information disclosure patterns in network traffic
SIEM Query:
EventID=20159 OR EventID=20160 from source="RemoteAccess" AND (destination_ip NOT IN allowed_networks)