CVE-2025-50402
📋 TL;DR
The FAST FAC1200R F400_FAC1200R_Q device contains a buffer overflow vulnerability in the password handling function that allows attackers to execute arbitrary code. This affects all users of this specific IoT device model. Attackers can potentially gain full control of the device through this vulnerability.
💻 Affected Systems
- FAST FAC1200R F400_FAC1200R_Q
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement to other network devices, and persistent backdoor installation.
Likely Case
Device takeover allowing network reconnaissance, credential harvesting, and participation in botnets or DDoS attacks.
If Mitigated
Limited impact if device is isolated in separate VLAN with strict network segmentation and access controls.
🎯 Exploit Status
Public GitHub repository contains exploit details; buffer overflow in password parameter makes exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Contact FAST vendor for security advisory
2. Check for firmware updates on vendor website
3. Apply firmware update following vendor instructions
4. Reboot device after update
🔧 Temporary Workarounds
Network Segmentation
allIsolate device in separate VLAN with strict firewall rules
Access Control
allRestrict administrative access to trusted IP addresses only
🧯 If You Can't Patch
- Replace vulnerable device with secure alternative
- Implement strict network monitoring and anomaly detection
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor advisory; test with controlled exploit if in lab environmentCheck Version:
Check web interface or CLI for firmware version informationVerify Fix Applied:
Verify firmware version matches patched version from vendor; test password parameter with overflow payloads📡 Detection & Monitoring
Log Indicators:
- Unusual authentication attempts
- Large password parameter values in logs
- Device reboot or crash logs
Network Indicators:
- Unusual outbound connections from device
- Traffic to known malicious IPs
- Anomalous protocol usage
SIEM Query:
source="fac1200r" AND (password.length>100 OR event="buffer_overflow")