CVE-2025-7549
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda FH1201 routers allows remote attackers to execute arbitrary code by manipulating the 'page' parameter in the frmL7ProtForm function. This affects Tenda FH1201 routers running firmware version 1.2.0.14(408). Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda FH1201
📦 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 device is behind firewall with strict inbound rules, though internal exploitation risk remains.
🎯 Exploit Status
Public proof-of-concept exploit code is available, making exploitation trivial for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No vendor advisory found at time of analysis
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. If update available, download and install via web interface. 3. Reboot router after installation. 4. Verify firmware version is no longer 1.2.0.14(408).
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to the vulnerable web interface
Access router web interface -> Advanced -> System Tools -> Remote Management -> Disable
Restrict web interface access
allLimit access to router management interface to trusted IPs only
Access router web interface -> Advanced -> Security -> Access Control -> Enable IP/MAC binding
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with strict firewall rules
- Implement network segmentation to limit lateral movement potential
🔍 How to Verify
Check if Vulnerable:
Access router web interface, navigate to System Status or About page, check firmware version matches 1.2.0.14(408)Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
After firmware update, verify version is different from 1.2.0.14(408) and test that /goform/L7Prot endpoint no longer accepts malformed 'page' parameter📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/L7Prot with large 'page' parameters
- Unusual process creation or memory allocation errors in router logs
Network Indicators:
- Unusual outbound connections from router IP
- Traffic patterns suggesting command and control communication
SIEM Query:
source="router_logs" AND (url="/goform/L7Prot" AND parameter_size>1000) OR (process="httpd" AND memory_allocation_error)🔗 References
- https://github.com/panda666-888/vuls/blob/main/tenda/fh1201/frmL7ProtForm.md
- https://github.com/panda666-888/vuls/blob/main/tenda/fh1201/frmL7ProtForm.md#poc
- https://vuldb.com/?ctiid.316247
- https://vuldb.com/?id.316247
- https://vuldb.com/?submit.614973
- https://www.tenda.com.cn/
- https://github.com/panda666-888/vuls/blob/main/tenda/fh1201/frmL7ProtForm.md
- https://github.com/panda666-888/vuls/blob/main/tenda/fh1201/frmL7ProtForm.md#poc
