CVE-2025-71019
📋 TL;DR
This vulnerability in Tenda AX-1806 routers allows attackers to cause a Denial of Service (DoS) by sending specially crafted requests that trigger a stack overflow in the wanSpeed parameter. Only users running Tenda AX-1806 v1.0.0.1 are affected by this specific vulnerability.
💻 Affected Systems
- Tenda AX-1806
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router crash requiring physical reboot, potentially disrupting all network connectivity for connected devices.
Likely Case
Router becomes unresponsive, requiring manual reboot to restore functionality.
If Mitigated
If properly segmented and firewalled, impact limited to router management interface only.
🎯 Exploit Status
Public GitHub repository contains proof-of-concept code. No authentication required for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
Check Tenda official website for firmware updates. If available, download and flash the latest firmware through the router's web interface.
🔧 Temporary Workarounds
Network Segmentation
allIsolate router management interface from untrusted networks
Access Control Lists
allRestrict access to router management interface to trusted IPs only
🧯 If You Can't Patch
- Replace affected router with different model or vendor
- Place router behind dedicated firewall with strict inbound rules
🔍 How to Verify
Check if Vulnerable:
Check router web interface or serial console for firmware version. If version is exactly v1.0.0.1, device is vulnerable.Check Version:
Check router web interface at http://[router-ip]/ or use serial console connectionVerify Fix Applied:
Verify firmware version has changed from v1.0.0.1 to a newer version.📡 Detection & Monitoring
Log Indicators:
- Multiple malformed requests to router management interface
- Router crash/reboot events
Network Indicators:
- Unusual traffic patterns to router management port
- Repeated requests with long wanSpeed parameters
SIEM Query:
source_ip="router_ip" AND (uri="*wanSpeed*" OR status_code=500)