← Port Encyclopedia
502
Modbus
TCP
Industrial
Critical Risk
Modbus — industrial control protocol, no authentication, SCADA/ICS attacks
🔍 How to Scan Port 502
nmap -sV -p 502 target
nmap -sV -sC --script=banner -p 502 target
nc -zv target 502
🛡️ Security Considerations
- Scan port 502 with
nmap -sVto identify the exact service and version - If Modbus is not needed, close or firewall this port immediately
- Check for default credentials if a management interface runs on this port
- Use
searchsploit modbusto find known exploits - Monitor traffic on port 502 with Wireshark or tcpdump for anomalies
- Ensure the service is patched to the latest version to prevent known CVE exploitation