CVE-2025-7529
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda FH1202 routers allows remote attackers to execute arbitrary code by manipulating the 'page' parameter in the fromNatlimit function. This affects Tenda FH1202 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 FH1202
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, enabling attackers to install persistent malware, pivot to internal networks, intercept traffic, or create botnet nodes.
Likely Case
Remote code execution resulting in device takeover, allowing attackers to modify router settings, intercept network traffic, or launch attacks against internal systems.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering, though internal attacks remain possible if the attacker gains initial access elsewhere.
🎯 Exploit Status
Public exploit details are available on GitHub, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download the latest firmware for FH1202. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to the vulnerable web interface
Access router admin > System > Remote Management > Disable
Network segmentation
allIsolate affected routers from critical networks
🧯 If You Can't Patch
- Replace affected devices with patched or different models
- Implement strict network access controls to limit exposure
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface at System > Firmware UpgradeCheck Version:
Check via web interface or SSH if enabled: cat /proc/versionVerify Fix Applied:
Verify firmware version is no longer 1.2.0.14(408) after update📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/Natlimit with long 'page' parameters
- Multiple failed login attempts followed by exploitation attempts
Network Indicators:
- Unusual outbound connections from router IP
- Traffic patterns suggesting command and control communication
SIEM Query:
source="router_logs" AND (url="/goform/Natlimit" AND param_length>100) OR (event="buffer_overflow" AND device="Tenda FH1202")