CVE-2025-29218
📋 TL;DR
Tenda W18E v2.0 router firmware version 16.01.0.11 contains a stack overflow vulnerability in the wifiPwd parameter at /goform/setModules endpoint. Attackers can exploit this via crafted POST requests to cause Denial of Service (DoS), potentially crashing the device. This affects users running the vulnerable firmware on Tenda W18E v2.0 routers.
💻 Affected Systems
- Tenda W18E v2.0
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical reboot, potential remote code execution if stack overflow can be controlled to execute arbitrary code (though not confirmed in this CVE).
Likely Case
Denial of Service causing router reboot and network disruption for connected devices.
If Mitigated
Limited impact if device is behind firewall with restricted web interface access.
🎯 Exploit Status
Proof of concept available showing simple POST request exploitation. No authentication required to trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates
2. If update available, download and flash via web interface
3. Factory reset after update recommended
4. Monitor for official patch release
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router web interface
Access router admin panel > Advanced > System > Remote Management > Disable
Restrict web interface access
allLimit access to router admin interface to trusted IPs only
Access router admin panel > Advanced > Security > Access Control > Add trusted IP ranges
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict firewall rules
- Implement network monitoring for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or About pageCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is updated beyond v16.01.0.11📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/setModules with large wifiPwd parameter
- Router reboot events in system logs
Network Indicators:
- Unusual POST requests to router IP on port 80/443 with oversized parameters
- Sudden loss of router connectivity
SIEM Query:
source="router_logs" AND (uri="/goform/setModules" AND method="POST" AND size_bytes>1000)