CVE-2025-8980
📋 TL;DR
This vulnerability in Tenda G1 routers allows attackers to upload malicious firmware due to insufficient authentication checks in the firmware update handler. Attackers could potentially compromise the router's functionality or gain persistent access. Only Tenda G1 routers running firmware version 16.01.7.8(3660) are affected.
💻 Affected Systems
- Tenda G1
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing persistent backdoor installation, network traffic interception, and lateral movement to connected devices.
Likely Case
Router firmware corruption leading to denial of service or installation of malicious firmware with limited persistence.
If Mitigated
No impact if firmware updates are disabled or network access is restricted.
🎯 Exploit Status
Exploit details are publicly available but require specific conditions and knowledge to execute successfully.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Tenda for updated firmware version
Vendor Advisory: Not provided in references
Restart Required: Yes
Instructions:
1. Check Tenda support website for firmware updates 2. Download latest firmware 3. Upload via router admin interface 4. Reboot router after installation
🔧 Temporary Workarounds
Disable remote firmware updates
allPrevent unauthorized firmware uploads by disabling remote update functionality
Network segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Disable WAN access to router management interface
- Implement strict firewall rules to limit access to router update port
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface matches 16.01.7.8(3660)Check Version:
Login to router admin interface and check System Status or Firmware InformationVerify Fix Applied:
Verify firmware version has been updated to a newer release📡 Detection & Monitoring
Log Indicators:
- Unexpected firmware update attempts
- Failed authentication to update endpoint
- Firmware version changes
Network Indicators:
- Unusual traffic to router update port (typically 80/443)
- Firmware upload packets to router IP
SIEM Query:
source="router_logs" AND (event="firmware_update" OR event="authentication_failure")