CVE-2025-15229
📋 TL;DR
A buffer overflow vulnerability in Tenda CH22 routers allows remote attackers to cause denial of service by manipulating the LISTLEN parameter in the fromDhcpListClient function. This affects Tenda CH22 routers up to version 1.0.0.1. The vulnerability can be exploited remotely without authentication.
💻 Affected Systems
- Tenda CH22
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router crash requiring physical reboot, disrupting all network connectivity for connected devices.
Likely Case
Router becomes unresponsive, requiring manual reboot to restore functionality.
If Mitigated
No impact if router is not internet-facing or behind proper network segmentation.
🎯 Exploit Status
Exploit code is publicly available on GitHub, making attacks easy to execute.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates 2. Download latest firmware 3. Upload via router admin interface 4. Reboot router
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to router management interface
Network segmentation
allPlace router behind firewall to restrict access
🧯 If You Can't Patch
- Replace affected routers with updated models
- Implement strict network access controls to limit exposure
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 1.0.0.1 or earlier, device is vulnerable.Check Version:
Check router web interface at 192.168.0.1 or 192.168.1.1Verify Fix Applied:
Verify firmware version is higher than 1.0.0.1 after update.📡 Detection & Monitoring
Log Indicators:
- Multiple requests to /goform/DhcpListClient
- Router reboot events
- Unusual traffic patterns
Network Indicators:
- HTTP POST requests to /goform/DhcpListClient with manipulated LISTLEN parameter
SIEM Query:
http.url:"/goform/DhcpListClient" AND http.method:POST