CVE-2022-25552
📋 TL;DR
A stack overflow vulnerability in Tenda AX1806 routers allows attackers to cause Denial of Service (DoS) by sending specially crafted requests to the form_fast_setting_wifi_set function. This affects Tenda AX1806 v1.0.0.1 routers, potentially disrupting network connectivity for users.
💻 Affected Systems
- Tenda AX1806
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router crash requiring physical reboot, persistent network downtime until device is restarted.
Likely Case
Router becomes unresponsive, requiring reboot to restore functionality, causing temporary network disruption.
If Mitigated
Minimal impact if device is behind firewall with restricted access to management interface.
🎯 Exploit Status
Exploit code is publicly available in GitHub repositories. Attack requires sending crafted HTTP request to vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Check Tenda website for firmware updates. If update exists, download from official source and apply through router web interface.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router web interface
Access router settings > Advanced > Remote Management > Disable
Change default admin credentials
allUse strong, unique credentials for router administration
Access router settings > System Tools > Password > Set strong password
🧯 If You Can't Patch
- Replace affected router with patched or different model
- Place router behind firewall with strict inbound rules blocking access to management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in 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. Test by attempting to access vulnerable endpoint with monitoring for crashes.📡 Detection & Monitoring
Log Indicators:
- Router crash/reboot logs
- Multiple failed login attempts to admin interface
- Unusual HTTP POST requests to /goform/fast_setting_wifi_set
Network Indicators:
- Sudden loss of connectivity to router
- Unusual traffic patterns to router management port (typically 80/443)
SIEM Query:
source="router_logs" AND ("crash" OR "reboot" OR "POST /goform/fast_setting_wifi_set")