CVE-2025-29806
📋 TL;DR
This vulnerability in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute arbitrary code over a network connection. It affects all users running vulnerable versions of Microsoft Edge, potentially enabling remote compromise of systems.
💻 Affected Systems
- Microsoft Edge (Chromium-based)
📦 What is this software?
Edge Chromium by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the victim's machine, data theft, and lateral movement within the network.
Likely Case
Remote code execution leading to malware installation, credential theft, or system disruption.
If Mitigated
Limited impact if network segmentation, application whitelisting, and proper endpoint protection are in place.
🎯 Exploit Status
Exploitation requires network access to the target system.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Edge update channel for latest security update
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29806
Restart Required: Yes
Instructions:
Open Microsoft Edge
Click Settings (three dots) → Help and feedback → About Microsoft Edge
Allow browser to check for and install updates
Restart browser when prompted
🔧 Temporary Workarounds
Disable Edge Network Access
allRestrict Microsoft Edge from accessing untrusted networks using firewall rules
Use Application Control
windowsImplement application whitelisting to prevent unauthorized code execution
🧯 If You Can't Patch
- Deploy network segmentation to isolate vulnerable systems
- Implement strict outbound firewall rules to limit potential command and control
🔍 How to Verify
Check if Vulnerable:
Check Microsoft Edge version in Settings → About Microsoft Edge and compare with patched version in Microsoft advisoryCheck Version:
On Windows: edge://version/ or macOS/Linux: open Edge → Settings → About Microsoft EdgeVerify Fix Applied:
Confirm Microsoft Edge version matches or exceeds the patched version listed in Microsoft's security update📡 Detection & Monitoring
Log Indicators:
- Unusual Edge process spawning child processes
- Suspicious network connections from Edge process
- Unexpected Edge crashes or abnormal behavior
Network Indicators:
- Unusual outbound connections from Edge to unknown IPs
- Suspicious payloads in network traffic to/from Edge
SIEM Query:
Process creation where parent_process contains 'msedge' AND (process contains 'cmd.exe' OR process contains 'powershell.exe' OR process contains suspicious binaries)