CVE-2025-7794
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda FH451 routers allows remote attackers to execute arbitrary code by manipulating the 'page' parameter in the fromNatStaticSetting function. This affects Tenda FH451 routers running firmware version 1.0.0.9. Successful exploitation could lead to complete device compromise.
💻 Affected Systems
- Tenda FH451
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full router compromise, persistence installation, network traffic interception, and lateral movement to internal systems.
Likely Case
Router compromise leading to denial of service, credential theft, or use as a pivot point for internal network attacks.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access, though internal threats remain if exploited from within network.
🎯 Exploit Status
Public proof-of-concept available on GitHub. Exploitation requires sending crafted HTTP request to /goform/NatStaticSetting endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Check Tenda website for firmware updates. If update exists: 1. Download latest firmware from Tenda support site 2. Log into router admin interface 3. Navigate to System Tools > Firmware Upgrade 4. Upload and apply new firmware
🔧 Temporary Workarounds
Disable WAN access to management interface
allPrevent external exploitation by blocking internet access to router admin interface
Router-specific: Disable 'Remote Management' in admin interface
Network segmentation
allIsolate router management interface to separate VLAN with restricted access
🧯 If You Can't Patch
- Replace affected devices with supported models from different vendors
- Implement strict network access controls to limit who can reach router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or System Tools. If version is 1.0.0.9, device is vulnerable.Check Version:
Router-specific: Check via web interface or use nmap -sV -p80,443 [router_ip] to identify service versionsVerify Fix Applied:
Verify firmware version has changed from 1.0.0.9 to a newer version after update.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /goform/NatStaticSetting with abnormal 'page' parameter values
- Router crash/reboot logs
- Unusual outbound connections from router
Network Indicators:
- HTTP POST requests to router IP on port 80/443 with long 'page' parameter
- Sudden changes in router configuration
SIEM Query:
source="router_logs" AND (uri="/goform/NatStaticSetting" AND (param_length("page")>100 OR param_contains("page", "\x90")))