CVE-2022-25558
📋 TL;DR
Tenda AX1806 routers running firmware v1.0.0.1 contain a stack overflow vulnerability in the formSetProvince function. Attackers can exploit this by sending specially crafted ProvinceCode parameters to cause a Denial of Service (DoS), potentially crashing the device. This affects all users of Tenda AX1806 routers with the vulnerable firmware version.
💻 Affected Systems
- Tenda AX1806
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical reboot, potentially leading to extended network downtime and disruption of all connected services.
Likely Case
Temporary DoS causing router reboot and brief network interruption until device restarts automatically.
If Mitigated
No impact if device is patched or not exposed to untrusted networks.
🎯 Exploit Status
Public GitHub repositories contain proof-of-concept code demonstrating the vulnerability exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Later than v1.0.0.1 (check Tenda for specific fixed version)
Vendor Advisory: Unknown - Check Tenda official website for security advisories
Restart Required: Yes
Instructions:
1. Log into Tenda router admin interface. 2. Navigate to System Tools > Firmware Upgrade. 3. Download latest firmware from Tenda official website. 4. Upload and install the firmware update. 5. Wait for router to reboot automatically.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Network Segmentation
allIsolate router management interface to trusted network segment only
🧯 If You Can't Patch
- Replace affected router with updated model or different vendor
- Implement network monitoring to detect exploitation attempts and alert on router reboots
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware VersionCheck Version:
Login to router web interface and navigate to System Status pageVerify Fix Applied:
Confirm firmware version is updated to a version later than v1.0.0.1📡 Detection & Monitoring
Log Indicators:
- Multiple failed HTTP POST requests to formSetProvince endpoint
- Router reboot logs without normal shutdown sequence
- Unusual traffic patterns to router management interface
Network Indicators:
- HTTP POST requests with unusually long ProvinceCode parameters
- Sudden loss of connectivity to router followed by reboot
SIEM Query:
source="router_logs" AND (uri="/goform/setProvince" OR message="reboot" OR message="crash")