CVE-2022-25548
📋 TL;DR
Tenda AX1806 routers running firmware v1.0.0.1 contain a stack overflow vulnerability in the fromSetSysTime function. Attackers can exploit this by sending specially crafted requests to the serverName parameter, causing a Denial of Service (DoS) that crashes 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 disrupting all network connectivity for connected devices.
Likely Case
Router becomes unresponsive, requiring manual reboot to restore functionality.
If Mitigated
No impact if device is patched or network segmentation prevents access to vulnerable interface.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. Exploitation requires sending a specially crafted HTTP request to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Tenda website for latest firmware
Vendor Advisory: Not publicly documented by vendor
Restart Required: Yes
Instructions:
1. Visit Tenda support website. 2. Download latest firmware for AX1806. 3. Log into router web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Network Segmentation
allIsolate router management interface to trusted network only
🧯 If You Can't Patch
- Replace vulnerable router with updated model
- 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 under System Status > Firmware VersionCheck Version:
Not applicable - check via web interfaceVerify Fix Applied:
Verify firmware version is updated beyond v1.0.0.1📡 Detection & Monitoring
Log Indicators:
- Multiple failed HTTP requests to router management interface
- Router reboot events without user action
Network Indicators:
- Unusual HTTP traffic to router IP on management ports
- Router becoming unresponsive to ping
SIEM Query:
source_ip='router_ip' AND (http_request LIKE '%serverName%' OR event='device_reboot')