CVE-2025-3203
📋 TL;DR
This vulnerability in Tenda W18E routers allows remote attackers to trigger a stack-based buffer overflow by manipulating the Password parameter in the formSetAccountList function. Attackers could potentially execute arbitrary code or crash the device. All users of affected Tenda W18E routers with internet-facing administration interfaces are at risk.
💻 Affected Systems
- Tenda W18E
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistence, and network infiltration
Likely Case
Device crash requiring physical reset, temporary denial of service
If Mitigated
No impact if device is not internet-facing and has proper network segmentation
🎯 Exploit Status
Exploit code is publicly available on GitHub; remote exploitation without authentication
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates 2. Download latest firmware 3. Upload via admin interface 4. Reboot router
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to router admin interface
Access router admin > Advanced > Remote Management > Disable
Network segmentation
allIsolate router management interface to trusted network
🧯 If You Can't Patch
- Replace vulnerable device with supported model
- Implement strict firewall rules blocking access to router admin interface from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System StatusCheck Version:
Access router web interface at http://192.168.0.1 or configured IPVerify Fix Applied:
Verify firmware version is newer than 16.01.0.11📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts
- Unusual POST requests to /goform/setModules
Network Indicators:
- Traffic to router admin port (typically 80/443) with long password parameters
SIEM Query:
source_ip="router_ip" AND uri_path="/goform/setModules" AND parameter="Password" AND length(value)>100