CVE-2025-57569
📋 TL;DR
This CVE describes a buffer overflow vulnerability in Tenda F3 routers through the portList parameter in the /goform/setNAT endpoint. Attackers could potentially execute arbitrary code or crash the device by sending specially crafted requests. This affects Tenda F3 router users running vulnerable firmware versions.
💻 Affected Systems
- Tenda F3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, allowing attackers to intercept traffic, modify configurations, or use the device as a pivot point into the network.
Likely Case
Denial of service causing router crashes and network disruption, requiring physical reset or firmware reflash to restore functionality.
If Mitigated
Limited impact if the vulnerable endpoint is not accessible from untrusted networks and proper network segmentation is in place.
🎯 Exploit Status
Exploitation requires sending crafted HTTP requests to the vulnerable endpoint. The CWE-120 classification indicates classic buffer overflow vulnerability patterns.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Tenda for latest firmware updates
Vendor Advisory: http://tenda.com
Restart Required: Yes
Instructions:
1. Log into Tenda F3 web interface. 2. Navigate to System Tools > Firmware Upgrade. 3. Download latest firmware from Tenda website. 4. Upload and install the firmware update. 5. Reboot the router after installation.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the web management interface
Network Segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Implement strict firewall rules to block access to port 80/443 on the router from untrusted networks
- Monitor for unusual HTTP requests to /goform/setNAT endpoint and implement rate limiting
🔍 How to Verify
Check if Vulnerable:
Check current firmware version in router web interface under System Status or System ToolsCheck Version:
curl -s http://router-ip/ | grep -i firmware or check web interfaceVerify Fix Applied:
Verify firmware version has been updated to a version later than V12.01.01.48_multi📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/setNAT with malformed portList parameters
- Router crash/reboot logs
Network Indicators:
- Multiple HTTP requests to router management interface with abnormal payload sizes
- Traffic patterns suggesting buffer overflow attempts
SIEM Query:
source="router_logs" AND (uri_path="/goform/setNAT" AND (content_length>1000 OR contains(param,"portList")))