CVE-2025-44176
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda FH451 routers running firmware version V1.0.0.9. The flaw exists in the formSafeEmailFilter function, enabling command injection attacks. Only users of this specific router model and firmware version are affected.
💻 Affected Systems
- Tenda FH451
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to intercept all network traffic, install persistent malware, pivot to internal networks, and brick the device.
Likely Case
Router takeover leading to DNS hijacking, credential theft from network traffic, and creation of botnet nodes for DDoS attacks.
If Mitigated
Limited impact if router is behind firewall with strict inbound rules and network segmentation prevents lateral movement.
🎯 Exploit Status
GitHub repository contains detailed vulnerability report and likely exploitation details. Command injection vulnerabilities typically have low exploitation complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates
2. If update available, download and flash via web interface
3. Factory reset after update
4. Change all default credentials
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Network Segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace router with supported model from different vendor
- Place router behind firewall with strict inbound rules blocking all unnecessary ports
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under System Status or About page. If version is V1.0.0.9, device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version has changed from V1.0.0.9 to a newer version after update.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to formSafeEmailFilter endpoint
- Command execution patterns in system logs
- Multiple failed login attempts followed by successful access
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Port scanning originating from router
SIEM Query:
source="router.logs" AND ("formSafeEmailFilter" OR "cmd.exe" OR "/bin/sh")