CVE-2025-7853
📋 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 fromSetIpBind function. This affects Tenda FH451 firmware version 1.0.0.9. Attackers can exploit this remotely without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda FH451
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement to internal networks, persistent backdoor installation, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept network traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering, though internal exploitation risk remains.
🎯 Exploit Status
Proof-of-concept exploit code is publicly available on GitHub. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. If an update is available, download the latest firmware. 3. Log into the router's web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Reboot the router after installation.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the router's web management interface
Network Segmentation
allIsolate the router management interface to a separate VLAN
🧯 If You Can't Patch
- Replace affected devices with supported models from vendors with active security updates
- Implement strict network access controls to limit access to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: System Status > Firmware Version. If version is 1.0.0.9, the device is vulnerable.Check Version:
Not applicable - check via web interface or router consoleVerify Fix Applied:
After updating, verify firmware version is no longer 1.0.0.9. Test that the /goform/SetIpBind endpoint properly validates input length.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetIpBind with long 'page' parameters
- Router crash/restart logs
- Unusual outbound connections from router
Network Indicators:
- Exploit traffic patterns to router management interface
- Unusual payloads in HTTP POST requests to router
SIEM Query:
source="router_logs" AND (uri_path="/goform/SetIpBind" AND content_length>1000) OR (event_type="crash" AND device_model="FH451")