CVE-2022-48130
📋 TL;DR
CVE-2022-48130 is a critical stack overflow vulnerability in Tenda W20E routers that allows remote attackers to execute arbitrary code or cause denial of service. The vulnerability affects users of Tenda W20E routers with firmware version 15.11.0.6. Attackers can exploit this by sending specially crafted requests to the formSetStaticRoute function.
💻 Affected Systems
- Tenda W20E
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network takeover, and lateral movement into connected networks.
Likely Case
Router crash causing denial of service, requiring physical reset and disrupting network connectivity.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Public GitHub repository contains detailed analysis and proof-of-concept. Exploitation requires network access to router's web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. If update available, download and install via web interface. 3. Factory reset after update. 4. Reconfigure settings securely.
🔧 Temporary Workarounds
Disable WAN Management
allPrevent external access to router web interface
Access router settings > Security > Disable Remote Management
Network Segmentation
linuxIsolate router management interface to trusted network
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_NET -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Replace affected routers with supported models from different vendors
- Implement strict network access controls to limit who can reach router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface: Settings > System Status > Firmware VersionCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is newer than v15.11.0.6 and test static route functionality📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts
- Unusual POST requests to /goform/setStaticRoute
- Router crash/reboot logs
Network Indicators:
- Unusual traffic to router port 80/443 from external IPs
- Large POST requests to static route endpoint
SIEM Query:
source="router.log" AND (url="/goform/setStaticRoute" OR "formSetStaticRoute") AND size>1000