CVE-2025-12265
📋 TL;DR
A buffer overflow vulnerability in Tenda CH22 router firmware version 1.0.0.1 allows remote attackers to execute arbitrary code by manipulating the 'page' parameter in the fromVirtualSer function. This affects all users of Tenda CH22 routers running the vulnerable firmware. Remote exploitation is possible without authentication.
💻 Affected Systems
- Tenda CH22
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete router compromise, credential theft, network traffic interception, and lateral movement to connected devices.
Likely Case
Router takeover enabling DNS hijacking, credential harvesting, and persistent backdoor installation.
If Mitigated
Limited impact if router is behind firewall with restricted WAN access and regular firmware updates.
🎯 Exploit Status
Public exploit available on GitHub, making exploitation straightforward for attackers.
🛠️ 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. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router administration interface
Network segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Replace vulnerable router with updated model
- Implement strict firewall rules blocking all WAN access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 1.0.0.1, device is vulnerable.Check Version:
Check via router web interface or SSH if enabled: cat /proc/version or show version commandsVerify Fix Applied:
Verify firmware version has changed from 1.0.0.1 to a newer version after update.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/VirtualSer
- Multiple failed buffer overflow attempts
- Unexpected router reboots
Network Indicators:
- Unusual traffic patterns to router management interface
- Suspicious payloads in HTTP requests
SIEM Query:
source="router_logs" AND (uri="/goform/VirtualSer" OR message="buffer overflow")