CVE-2026-3168
📋 TL;DR
A buffer overflow vulnerability in Tenda F453 routers allows remote attackers to execute arbitrary code by manipulating the 'page' argument in the NatStaticSetting function. This affects Tenda F453 router users running firmware version 1.0.0.3. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda F453
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement into internal networks, and persistent backdoor installation.
Likely Case
Router takeover enabling traffic interception, DNS manipulation, credential theft, and denial of service.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public exploit code is available in GitHub repositories. The vulnerability requires sending a specially crafted HTTP request to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download the latest firmware for F453. 3. Access router admin 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
Access router admin panel > System Tools > Remote Management > Disable
Restrict Management Interface Access
allLimit access to router management interface to trusted IP addresses only
Access router admin panel > Security > Access Control > Add trusted IP ranges
🧯 If You Can't Patch
- Isolate affected routers in a separate VLAN with strict firewall rules
- Implement network monitoring for suspicious HTTP requests to /goform/NatStaticSetting
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface: System Status > Firmware Version. If version is 1.0.0.3, device is vulnerable.Check Version:
curl -s http://router-ip/ | grep -i 'firmware' or check web interfaceVerify Fix Applied:
After firmware update, verify version is no longer 1.0.0.3. Test by attempting to access /goform/NatStaticSetting with invalid parameters.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/NatStaticSetting
- Large or malformed 'page' parameter values in HTTP requests
- Router crash or reboot logs
Network Indicators:
- HTTP traffic to router IP on port 80/443 with abnormal request patterns
- Multiple failed exploitation attempts to /goform/NatStaticSetting
SIEM Query:
source="router_logs" AND (url="/goform/NatStaticSetting" OR (method="POST" AND uri CONTAINS "NatStaticSetting"))