CVE-2025-48814
📋 TL;DR
This vulnerability allows unauthorized attackers to bypass security features in Windows Remote Desktop Licensing Service by exploiting missing authentication for critical functions. Attackers can execute this over a network without credentials. Organizations using Windows Remote Desktop Licensing Service are affected.
💻 Affected Systems
- Windows Remote Desktop Licensing Service
📦 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 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of Remote Desktop Licensing Service allowing unauthorized license manipulation, service disruption, or potential lateral movement within the network.
Likely Case
Unauthorized access to licensing functions leading to service disruption, license manipulation, or information disclosure.
If Mitigated
Limited impact if service is properly segmented, monitored, and access-controlled.
🎯 Exploit Status
Exploitation requires network access to the licensing service port (typically TCP 135 or specific RPC ports).
🛠️ 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-2025-48814
Restart Required: Yes
Instructions:
1. Apply latest Windows security updates from Microsoft
2. Specifically install updates for Remote Desktop Services components
3. Restart affected servers to complete installation
🔧 Temporary Workarounds
Disable Remote Desktop Licensing Service
windowsTemporarily disable the service if not required
sc stop TermServLicensing
sc config TermServLicensing start= disabled
Network Segmentation
allRestrict network access to Remote Desktop Licensing Service ports
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Remote Desktop Licensing Service from untrusted networks
- Enable detailed logging and monitoring for unauthorized access attempts to the service
🔍 How to Verify
Check if Vulnerable:
Check if Remote Desktop Licensing Service is installed and running on Windows Server systemsCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify Windows Update history contains the relevant security update and service is restarted📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to Remote Desktop Licensing Service in Windows Event Logs
- Unexpected service stops or configuration changes
Network Indicators:
- Unusual network traffic to Remote Desktop Licensing ports (TCP 135, RPC ports)
- Connection attempts from unauthorized IP addresses
SIEM Query:
source="Windows Security" EventCode=4625 OR EventCode=4672 AND process_name="*TermServLicensing*"