CVE-2025-25678
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda i12 routers by sending specially crafted requests to the formSetCfm function. Attackers can exploit the buffer overflow in the funcpara1 parameter to gain full control of affected devices. All users running the vulnerable firmware version are affected.
💻 Affected Systems
- Tenda i12
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, credential theft, network traffic interception, and lateral movement to other devices on the network.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as part of a botnet.
If Mitigated
Limited impact if device is behind firewall with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
The GitHub reference contains technical details and proof-of-concept information. Buffer overflow vulnerabilities in network devices are commonly weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download the latest firmware for i12 model. 3. Access router web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the router's web interface
Access router web interface > Advanced > System Tools > Remote Management > Disable
Network Segmentation
allIsolate the router from critical internal networks
🧯 If You Can't Patch
- Replace the vulnerable device with a different model or vendor
- Place the router behind a firewall that blocks all inbound traffic to its management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface: System Status > Firmware Version. If it shows V1.0.0.10(3805), the device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep firmware_versionVerify Fix Applied:
After updating firmware, verify the version no longer shows V1.0.0.10(3805). Test by attempting to access the vulnerable endpoint with test payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/setcfm
- Multiple failed authentication attempts followed by successful access
- Unexpected process execution or configuration changes
Network Indicators:
- Unusual outbound connections from router IP
- Traffic patterns suggesting command and control communication
- Port scanning originating from router
SIEM Query:
source="router_logs" AND (uri="/goform/setcfm" OR funcpara1="*")