CVE-2025-47976
📋 TL;DR
A use-after-free vulnerability in Windows SSDP Service allows authenticated attackers to execute arbitrary code with elevated SYSTEM privileges. This affects Windows systems with SSDP service enabled, primarily impacting enterprise environments where local users could escalate privileges.
💻 Affected Systems
- Windows SSDP Service
📦 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 22h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Full SYSTEM privilege escalation leading to complete system compromise, lateral movement, and persistence establishment.
Likely Case
Local authenticated attacker gains SYSTEM privileges to install malware, disable security controls, or access sensitive data.
If Mitigated
Limited impact with proper privilege separation, endpoint protection, and network segmentation in place.
🎯 Exploit Status
Requires local authenticated access. Use-after-free vulnerabilities typically require precise timing and memory manipulation.
🛠️ 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-2025-47976
Restart Required: Yes
Instructions:
1. Apply latest Windows security updates via Windows Update
2. For enterprise: Deploy via WSUS or Microsoft Endpoint Configuration Manager
3. Verify update installation with 'wmic qfe list' command
🔧 Temporary Workarounds
Disable SSDP Service
windowsDisable the SSDP Discovery service if not required
sc config SSDPSRV start= disabled
sc stop SSDPSRV
Block SSDP Ports
windowsBlock UDP port 1900 and TCP port 2869 via firewall
netsh advfirewall firewall add rule name="Block SSDP" dir=in action=block protocol=UDP localport=1900
netsh advfirewall firewall add rule name="Block SSDP TCP" dir=in action=block protocol=TCP localport=2869
🧯 If You Can't Patch
- Implement strict least privilege access controls to limit local user privileges
- Deploy endpoint detection and response (EDR) solutions to monitor for privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check if SSDP service is running: 'sc query SSDPSRV' and verify Windows version is unpatchedCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify security update is installed: 'wmic qfe list | findstr /i KB' and check specific KB number from Microsoft advisory📡 Detection & Monitoring
Log Indicators:
- Event ID 4688: New process creation with SYSTEM privileges from non-SYSTEM accounts
- Event ID 4672: Special privileges assigned to new logon
- SSDP service crashes or unexpected restarts
Network Indicators:
- Unusual SSDP traffic patterns
- Multiple SSDP service connection attempts
SIEM Query:
source="windows" (event_id=4688 OR event_id=4672) AND user!="SYSTEM" AND parent_process_name="svchost.exe" AND process_name="cmd.exe" OR process_name="powershell.exe"