CVE-2025-55606
📋 TL;DR
This CVE describes a buffer overflow vulnerability in Tenda AX3 routers running firmware version V16.03.12.10_CN. Attackers can exploit this by sending specially crafted requests to the serverName parameter, potentially allowing remote code execution or denial of service. Only users with this specific firmware version are affected.
💻 Affected Systems
- Tenda AX3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete router compromise, credential theft, and lateral movement into internal networks.
Likely Case
Router crash causing denial of service, requiring physical reset to restore functionality.
If Mitigated
Limited impact if network segmentation isolates the router and intrusion prevention systems block exploit attempts.
🎯 Exploit Status
Public proof-of-concept exists in GitHub repository. Exploitation appears straightforward based on available technical details.
🛠️ 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. Download latest firmware for AX3. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Wait for router to reboot.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router management interface
Access router admin panel -> Advanced Settings -> Remote Management -> Disable
Network segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Replace router with different model or vendor
- Implement strict firewall rules to block all external access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is exactly V16.03.12.10_CN, device is vulnerable.Check Version:
Login to router admin interface and check System Status or Firmware Version pageVerify Fix Applied:
Verify firmware version has changed from V16.03.12.10_CN to a newer version after update.📡 Detection & Monitoring
Log Indicators:
- Unusual requests to router management interface
- Router crash/reboot events in system logs
- Multiple failed connection attempts
Network Indicators:
- Unusual traffic patterns to router management port (typically 80/443)
- Exploit pattern matching in serverName parameter
SIEM Query:
source="router_logs" AND (event="crash" OR event="reboot") OR (http_request CONTAINS "serverName" AND length(http_request) > threshold)