CVE-2025-57571
📋 TL;DR
This CVE describes a buffer overflow vulnerability in Tenda F3 routers via the macFilterList parameter in the goform/setNAT endpoint. Attackers can potentially execute arbitrary code or crash the device by sending specially crafted requests. This affects all users running vulnerable firmware versions on Tenda F3 routers.
💻 Affected Systems
- Tenda F3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, and lateral movement to connected networks.
Likely Case
Denial of service causing router crashes and network disruption, potentially requiring physical reset.
If Mitigated
Limited impact if network segmentation isolates the router and external access is restricted.
🎯 Exploit Status
Exploitation requires access to the web management interface. The CWE-120 classification indicates classic buffer overflow vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Tenda website for latest firmware
Vendor Advisory: http://tenda.com
Restart Required: Yes
Instructions:
1. Log into Tenda router web interface. 2. Navigate to System Tools > Firmware Upgrade. 3. Download latest firmware from Tenda website. 4. Upload and install firmware. 5. Router will reboot automatically.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router web interface
Restrict management access
allLimit web interface access to specific IP addresses only
🧯 If You Can't Patch
- Segment router management interface to isolated VLAN
- Implement network firewall rules to block access to goform/setNAT endpoint
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Status. If version is V12.01.01.48_multi or later, device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
After firmware update, verify version shows newer than V12.01.01.48_multi. Test by attempting to access the vulnerable endpoint.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/setNAT with large macFilterList parameters
- Router crash/reboot logs
- Unusual traffic patterns to router management interface
Network Indicators:
- HTTP POST requests to /goform/setNAT with abnormally long parameters
- Sudden loss of connectivity to router
SIEM Query:
source="router_logs" AND (uri_path="/goform/setNAT" AND content_length>1000)