CVE-2024-40414
📋 TL;DR
A stack-based buffer overflow vulnerability in Tenda AX1806 router firmware allows remote attackers to execute arbitrary code or crash the device. This affects users running vulnerable firmware versions on Tenda AX1806 routers. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Tenda AX1806
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network traffic interception, and lateral movement into connected networks.
Likely Case
Router crash causing denial of service, or remote code execution allowing attacker persistence on the device.
If Mitigated
Limited impact if device is behind firewall with restricted access to management interface.
🎯 Exploit Status
Public proof-of-concept available on GitHub. The vulnerability requires sending crafted HTTP requests to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates
2. Download latest firmware for AX1806
3. Access router web interface
4. Navigate to firmware upgrade section
5. Upload and apply new firmware
6. Reboot router after update
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router web interface
Restrict management interface access
linuxUse firewall rules to limit access to router management IP/ports
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Replace affected router with different model/brand
- Place router behind additional firewall with strict access controls
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface or via SSH if available. Version 1.0.0.1 is vulnerable.Check Version:
Check router web interface at http://router_ip/ or use nmap to identify device versionVerify Fix Applied:
Verify firmware version is updated to a version later than 1.0.0.1📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/SetNetControlList
- Router crash/reboot logs
- Large payloads in HTTP requests
Network Indicators:
- HTTP requests with oversized parameters to router management interface
- Unusual traffic patterns to router port 80/443
SIEM Query:
source="router_logs" AND (uri="/goform/SetNetControlList" OR message="buffer overflow" OR message="segmentation fault")