CVE-2026-3810
📋 TL;DR
A stack-based buffer overflow vulnerability in Tenda FH1202 routers allows remote attackers to execute arbitrary code by manipulating the 'page' parameter in the DHCP client list function. This affects Tenda FH1202 routers running firmware version 1.2.0.14(408). Remote exploitation is possible 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
Remote code execution allowing attackers to install malware, create backdoors, or use the device as part of a botnet.
If Mitigated
Denial of service or device crash if exploit fails to achieve code execution.
🎯 Exploit Status
Public exploit code available on GitHub. No authentication required for exploitation.
🛠️ 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. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router web interface
Network segmentation
allIsolate affected routers from critical networks
🧯 If You Can't Patch
- Replace affected routers with different models or brands
- Implement strict network access controls to limit exposure
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 1.2.0.14(408), device is vulnerable.Check Version:
Check via router web interface or SSH if enabled: cat /proc/version or similar router-specific commandsVerify Fix Applied:
Verify firmware version has changed from 1.2.0.14(408) to a newer version.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/DhcpListClient
- Router crash/reboot logs
- Unusual outbound connections from router
Network Indicators:
- Exploit traffic patterns to router web interface
- Unusual payloads in HTTP requests
SIEM Query:
source="router_logs" AND (uri="/goform/DhcpListClient" OR message="buffer overflow" OR message="segmentation fault")