CVE-2024-7707
📋 TL;DR
This critical vulnerability in Tenda FH1206 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the formSafeEmailFilter function. Attackers can exploit this by sending specially crafted HTTP POST requests to the vulnerable component. All users running affected firmware versions are at risk of complete device compromise.
💻 Affected Systems
- Tenda FH1206
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full router compromise, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Router takeover enabling traffic interception, DNS manipulation, and lateral movement into connected networks.
If Mitigated
Limited impact if device is isolated behind firewalls with strict inbound filtering, though internal network risk remains.
🎯 Exploit Status
Public exploit details are available on GitHub, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Vendor was contacted but did not respond. Consider replacing affected devices with supported models.
🔧 Temporary Workarounds
Disable remote management
allDisable web management interface access from WAN/Internet to prevent remote exploitation
Access router admin panel → Advanced Settings → Remote Management → Disable
Network segmentation
allIsolate affected routers in separate VLANs with strict firewall rules
🧯 If You Can't Patch
- Replace affected Tenda FH1206 routers with supported/patched models from different vendors
- Implement strict network access controls to limit traffic to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin panel under System Status → Firmware VersionCheck Version:
Login to router web interface and navigate to System Status pageVerify Fix Applied:
No fix available to verify. Monitor for vendor updates and consider device replacement.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/SafeEmailFilter with long parameter values
- Multiple failed buffer overflow attempts in web server logs
Network Indicators:
- HTTP traffic to router IP on port 80/443 with POST requests containing buffer overflow patterns
- Unusual outbound connections from router after exploitation
SIEM Query:
source="router_logs" AND (url="/goform/SafeEmailFilter" OR method="POST" AND uri CONTAINS "SafeEmailFilter")