CVE-2025-70747
📋 TL;DR
Tenda AX-1806 routers running firmware v1.0.0.1 contain a stack overflow vulnerability in the serviceName parameter that allows remote attackers to crash the device via specially crafted requests. This affects all users of Tenda AX-1806 routers with the vulnerable firmware version. The vulnerability can be exploited without authentication to cause denial of service.
💻 Affected Systems
- Tenda AX-1806
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical power cycle, potentially leading to extended network downtime and service disruption.
Likely Case
Router becomes unresponsive, requiring manual reboot and causing temporary network outage for connected devices.
If Mitigated
Limited impact if device is behind firewall with restricted access to management interface.
🎯 Exploit Status
Proof of concept code is publicly available on GitHub. Exploitation requires sending a specially crafted HTTP request to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda support website for firmware updates
2. If update available, download latest firmware
3. Access router admin interface
4. Navigate to firmware upgrade section
5. Upload and install new firmware
6. Wait for router to reboot
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Restrict Management Interface Access
linuxUse firewall rules to limit access to router management IP/ports
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Isolate router on separate VLAN with restricted access
- Implement network monitoring for DoS attempts against router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under System Status or About pageCheck Version:
curl -s http://router-ip/status.cgi | grep versionVerify Fix Applied:
Verify firmware version is no longer v1.0.0.1 after update📡 Detection & Monitoring
Log Indicators:
- Repeated connection attempts to router management interface
- Router reboot events in system logs
- HTTP requests with long serviceName parameters
Network Indicators:
- Unusual HTTP POST requests to router management interface
- Traffic patterns indicating DoS attempts
SIEM Query:
source="router.log" AND ("POST /goform" OR "serviceName" AND length>100)