CVE-2022-25554
📋 TL;DR
Tenda AX1806 routers running firmware v1.0.0.1 contain a stack overflow vulnerability in the saveParentControlInfo function. Attackers can exploit this via the deviceId parameter 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 reset, potentially leading to extended network downtime and loss of connectivity for all connected devices.
Likely Case
Router becomes unresponsive, requiring reboot to restore functionality, causing temporary network disruption.
If Mitigated
No impact if device is patched or workarounds are implemented to block exploitation attempts.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Tenda website for latest firmware
Vendor Advisory: https://www.tendacn.com/en/
Restart Required: Yes
Instructions:
1. Visit Tenda official website. 2. Download latest firmware for AX1806. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Parent Control Feature
allDisable the vulnerable parent control functionality if not needed
Network Segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Replace affected router with updated model or different vendor
- Implement network monitoring to detect exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or System ToolsCheck Version:
Login to router admin interface and check firmware version in system settingsVerify Fix Applied:
Confirm firmware version is updated beyond v1.0.0.1 and test parent control functionality📡 Detection & Monitoring
Log Indicators:
- Router crash logs
- Unusual reboot events
- Failed parent control configuration attempts
Network Indicators:
- Unusual HTTP requests to router management interface with long deviceId parameters
- Router becoming unresponsive
SIEM Query:
source="router_logs" AND (event="crash" OR event="reboot") AND device_model="AX1806"