CVE-2026-3166
📋 TL;DR
A buffer overflow vulnerability in Tenda F453 routers allows remote attackers to execute arbitrary code by manipulating the 'page' argument in the fromRouteStatic function. This affects Tenda F453 router users running firmware version 1.0.0.3. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Tenda F453
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, and potential lateral movement to connected systems.
Likely Case
Router compromise allowing attacker to intercept traffic, modify DNS settings, or create persistent backdoors.
If Mitigated
Denial of service or router crash if exploit fails to achieve code execution.
🎯 Exploit Status
Public exploit details are available in GitHub repositories, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware for F453 model. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router after update completes.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router administration interface
Access router admin panel -> Advanced Settings -> Remote Management -> Disable
Network Segmentation
allIsolate router management interface to trusted network segment
Configure firewall rules to restrict access to router IP on port 80/443 to trusted IPs only
🧯 If You Can't Patch
- Replace vulnerable router with different model or vendor
- Implement network-based intrusion prevention system (IPS) to block exploit attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware Upgrade sectionCheck Version:
curl -s http://router-ip/goform/getStatus | grep version or check web interfaceVerify Fix Applied:
Verify firmware version has changed from 1.0.0.3 to a newer version📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/RouteStatic
- Router crash/restart logs
- Buffer overflow error messages in system logs
Network Indicators:
- Malformed HTTP requests to router port 80/443 targeting /goform/RouteStatic
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (uri="/goform/RouteStatic" OR message="buffer overflow" OR message="segmentation fault")