CVE-2025-44864
📋 TL;DR
This CVE describes a command injection vulnerability in Tenda W20E routers that allows attackers to execute arbitrary commands on the device. Attackers can exploit this by sending specially crafted requests to the vulnerable formSetDebugCfg function. This affects users running Tenda W20E routers with the vulnerable firmware version.
💻 Affected Systems
- Tenda W20E
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent backdoors, intercept network traffic, pivot to internal networks, or brick the device.
Likely Case
Attackers gain shell access to execute commands, potentially leading to network reconnaissance, credential theft, or launching attacks against other devices.
If Mitigated
If network segmentation and access controls are properly implemented, impact is limited to the router itself without lateral movement.
🎯 Exploit Status
Exploitation requires authentication to the router's web interface. The GitHub reference contains technical details about the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download the latest firmware for W20E. 3. Access router web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the router's web management interface
Restrict Management Access
allLimit management interface access to specific trusted IP addresses only
🧯 If You Can't Patch
- Segment the router on a dedicated network VLAN to limit lateral movement
- Implement strict firewall rules to block all unnecessary inbound traffic to the router
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: System Status > Firmware Version. If version is V15.11.0.6, device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
After updating firmware, verify the version has changed from V15.11.0.6 to a newer version.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/setDebugCfg
- Multiple failed login attempts followed by successful login and command execution
Network Indicators:
- Unusual outbound connections from router to external IPs
- Traffic patterns indicating command and control communication
SIEM Query:
source="router_logs" AND (uri="/goform/setDebugCfg" OR (module="debug" AND cmd="*"))