CVE-2026-3807
📋 TL;DR
A stack-based buffer overflow vulnerability in Tenda FH1202 routers allows remote attackers to execute arbitrary code by manipulating the mit_ssid or mit_ssid_index parameters in the formWrlsafeset function. This affects Tenda FH1202 router users running firmware version 1.2.0.14(408). The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Tenda FH1202
📦 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 other systems.
Likely Case
Router compromise allowing attackers to intercept traffic, modify DNS settings, or create persistent backdoors.
If Mitigated
Limited impact with proper network segmentation and firewall rules preventing external access to router admin interfaces.
🎯 Exploit Status
Public exploit code is available, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router admin interface
Network Segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Replace affected router with different model or vendor
- Implement strict firewall rules blocking all external access to router admin interface (port 80/443)
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or System ToolsCheck Version:
Not applicable - check via web interfaceVerify Fix Applied:
Verify firmware version is no longer 1.2.0.14(408) after update📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/AdvSetWrlsafeset with long mit_ssid parameters
- Router crash or reboot logs
Network Indicators:
- External IP addresses accessing router admin interface
- Unusual traffic patterns from router
SIEM Query:
source="router.log" AND (uri="/goform/AdvSetWrlsafeset" AND (param="mit_ssid" OR param="mit_ssid_index") AND length>100)