CVE-2025-12271
📋 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 fromRouteStatic function. This affects all users running the vulnerable firmware version on Tenda CH22 routers. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Tenda CH22 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete router compromise, network traffic interception, credential theft, and lateral movement to connected devices.
Likely Case
Router compromise allowing attacker to modify DNS settings, intercept traffic, or use the router as a botnet node.
If Mitigated
Limited impact if network segmentation isolates the router and regular credential rotation is implemented.
🎯 Exploit Status
Public exploit code is 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 install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to router administration interface
Network segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected routers with patched or different vendor models
- Implement strict firewall rules blocking all external 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 router web interface or use nmap/router scanning tools to identify firmware versionVerify Fix Applied:
Verify firmware version has been updated to a version later than 1.0.0.1📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/RouteStatic
- Multiple failed buffer overflow attempts
- Unexpected router reboots
Network Indicators:
- Unusual outbound connections from router
- DNS hijacking patterns
- Traffic redirection
SIEM Query:
source_ip=router_ip AND (uri_path="/goform/RouteStatic" OR event_description CONTAINS "buffer overflow")