CVE-2025-29967
📋 TL;DR
A heap-based buffer overflow vulnerability in Microsoft's Remote Desktop Gateway Service allows unauthenticated attackers to execute arbitrary code remotely over a network. This affects organizations using Remote Desktop Gateway for remote access. Attackers can potentially take full control of affected systems.
💻 Affected Systems
- Microsoft Remote Desktop Gateway
📦 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 21h2 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
Windows 11 24h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to domain takeover, data exfiltration, ransomware deployment, and lateral movement across the network.
Likely Case
Remote code execution leading to malware installation, credential theft, and persistent backdoor access to the compromised system.
If Mitigated
Limited impact due to network segmentation, strong authentication requirements, and proper access controls preventing exploitation attempts.
🎯 Exploit Status
Based on CVSS score and description, exploitation appears feasible but requires specific network access to the service
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: To be determined from Microsoft's security update
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29967
Restart Required: Yes
Instructions:
1. Check Microsoft's security advisory for the specific patch
2. Apply the latest Windows Server security update
3. Restart the Remote Desktop Gateway service or the entire server
🔧 Temporary Workarounds
Disable Remote Desktop Gateway Service
windowsTemporarily disable the vulnerable service if not required
Stop-Service -Name TSGateway -Force
Set-Service -Name TSGateway -StartupType Disabled
Network Access Restrictions
windowsRestrict network access to Remote Desktop Gateway ports (typically 443)
New-NetFirewallRule -DisplayName 'Block RDG' -Direction Inbound -LocalPort 443 -Protocol TCP -Action Block
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Remote Desktop Gateway servers
- Require VPN access before allowing Remote Desktop Gateway connections
🔍 How to Verify
Check if Vulnerable:
Check if Remote Desktop Gateway Service is running and accessible on the networkCheck Version:
Get-WindowsUpdateLog | Select-String -Pattern 'Security Update'Verify Fix Applied:
Verify the latest Windows security update is installed and the service version matches patched version📡 Detection & Monitoring
Log Indicators:
- Unusual authentication failures in Remote Desktop Gateway logs
- Multiple connection attempts from single IPs
- Process creation events from TSGateway service
Network Indicators:
- Unusual traffic patterns to port 443 on RDG servers
- Large or malformed packets to RDG service
SIEM Query:
source='Windows Security' AND event_id=4625 AND process_name='TSGateway.exe'