CVE-2025-70651
📋 TL;DR
A stack overflow vulnerability in Tenda AX-1803 routers allows attackers to cause Denial of Service (DoS) by sending specially crafted requests to the SSID parameter. This affects users running Tenda AX-1803 v1.0.0.1 firmware. Attackers can crash the router's web interface or potentially execute arbitrary code.
💻 Affected Systems
- Tenda AX-1803
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, and network infiltration.
Likely Case
Denial of Service causing router reboot or web interface crash, disrupting network connectivity.
If Mitigated
Temporary service interruption with automatic recovery after router reboot.
🎯 Exploit Status
Exploit requires authentication to the web interface. Public proof-of-concept demonstrates DoS capability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda support website for firmware updates
2. Download latest firmware for AX-1803
3. Log into router web interface
4. Navigate to System Tools > Firmware Upgrade
5. Upload and install new firmware
6. Reboot router after installation
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to web management interface
Login to router > Advanced > System Tools > Remote Management > Disable
Change Default Credentials
allUse strong unique passwords to reduce authentication risk
Login to router > Advanced > System Tools > Password > Set strong password
🧯 If You Can't Patch
- Isolate router on separate VLAN with restricted network access
- Implement network firewall rules to block unauthorized access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface: Login > Advanced > System Status > Firmware VersionCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is newer than v1.0.0.1 and test SSID parameter with long input📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts
- Unusual long SSID parameter values in HTTP requests
- Router reboot events
Network Indicators:
- HTTP POST requests to /goform/fast_setting_wifi_set with oversized SSID parameter
- Unusual traffic to router management port (typically 80/443)
SIEM Query:
source="router_logs" AND (uri="/goform/fast_setting_wifi_set" AND parameter_length>100) OR event="reboot"