CVE-2025-2993
📋 TL;DR
This critical vulnerability in Tenda FH1202 routers allows improper access controls through manipulation of the /default.cfg file, potentially enabling unauthorized remote access. Attackers can exploit this remotely to compromise affected devices. Users of Tenda FH1202 routers with vulnerable firmware are at risk.
💻 Affected Systems
- Tenda FH1202
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover allowing attacker to reconfigure router settings, intercept network traffic, or use device as pivot point for further attacks
Likely Case
Unauthorized access to router configuration leading to network disruption or credential theft
If Mitigated
Limited impact if proper network segmentation and access controls prevent external exploitation
🎯 Exploit Status
Exploit details publicly disclosed; remote exploitation possible without authentication
🛠️ 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 apply firmware update
5. Reboot router
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router administration interface
Network segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Replace vulnerable device with patched or different model
- 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 1.2.0.14(408), device is vulnerableCheck Version:
Check router web interface or use nmap/router scanning toolsVerify Fix Applied:
Verify firmware version has changed from 1.2.0.14(408) to newer version📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to /default.cfg
- Unexpected configuration changes
Network Indicators:
- Unusual traffic to router management port from external sources
SIEM Query:
source_ip=external AND dest_port=router_admin_port AND uri_path="/default.cfg"