CVE-2025-9006
📋 TL;DR
A buffer overflow vulnerability in Tenda CH22 router firmware version 1.0.0.1 allows remote attackers to execute arbitrary code by exploiting the formdelFileName function. This affects all users of Tenda CH22 routers running the vulnerable firmware version. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Tenda CH22
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, and potential lateral movement to connected systems.
Likely Case
Router takeover allowing traffic interception, DNS manipulation, credential theft, and deployment of persistent malware.
If Mitigated
Denial of service or router crash requiring physical reset if exploit fails or is partially successful.
🎯 Exploit Status
Exploit code is publicly available on GitHub, making this easily weaponizable by 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. Upload and install new firmware 5. Reboot router
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router administration interface
Access router admin panel → Security → Disable Remote Management
Network segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected routers with different 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 at 192.168.0.1 or 192.168.1.1 → System StatusVerify Fix Applied:
Verify firmware version has been updated to a version later than 1.0.0.1📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/delFileName
- Router crash/reboot logs
- Unusual process execution
Network Indicators:
- Exploit traffic patterns to router management interface
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (uri="/goform/delFileName" OR message="buffer overflow")