CVE-2025-21274
📋 TL;DR
This vulnerability in Windows Event Tracing allows attackers to cause a denial of service condition by sending specially crafted requests. It affects Windows systems with Event Tracing enabled, potentially disrupting system monitoring and logging capabilities.
💻 Affected Systems
- Microsoft Windows
📦 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
Complete system crash or unavailability of critical monitoring/logging services, disrupting operations and incident response capabilities.
Likely Case
Temporary service disruption affecting Event Tracing functionality, potentially impacting applications that rely on ETW for logging or monitoring.
If Mitigated
Minimal impact with proper network segmentation and access controls limiting exposure to untrusted sources.
🎯 Exploit Status
Exploitation requires local access or ability to interact with Event Tracing services; no public exploit code available at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: To be determined via Microsoft Security Update
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21274
Restart Required: Yes
Instructions:
1. Check Microsoft Security Update Guide for CVE-2025-21274
2. Download appropriate security update for your Windows version
3. Apply update following Microsoft's deployment guidance
4. Restart system as required
🔧 Temporary Workarounds
Restrict Event Tracing Access
windowsLimit access to Event Tracing services through firewall rules and access controls
netsh advfirewall firewall add rule name="Block ETW" dir=in action=block program="%SystemRoot%\System32\svchost.exe" service="etw" enable=yes
Disable Unnecessary ETW Providers
windowsDisable Event Tracing providers not required for operations
logman stop "ProviderName" -ets
logman delete "ProviderName"
🧯 If You Can't Patch
- Implement network segmentation to isolate systems with Event Tracing services
- Apply principle of least privilege to limit who can interact with ETW services
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for CVE-2025-21274 patch or use Microsoft's security update verification toolsCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify patch installation via Windows Update history or systeminfo command showing latest security updates📡 Detection & Monitoring
Log Indicators:
- Event Tracing service crashes or unexpected terminations in System logs
- High volume of ETW-related errors or access attempts
Network Indicators:
- Unusual traffic patterns to Event Tracing service ports
- Multiple connection attempts to ETW endpoints
SIEM Query:
EventID=7034 OR EventID=1000 AND SourceName="Service Control Manager" AND ServiceName contains "ETW"