← 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 -sV to 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 modbus to 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

🔗 Related Industrial Ports

Port 102
ISO-TSAP
Port 1911
Niagara-Fox
Port 20000
DNP3
Port 44818
EtherNet-IP
Port 47808
BACnet

📍 Nearby Ports

Port 497
Retrospect
Port 498
Port-498
Port 499
Port-499
Port 500
IKE
Port 501
Port-501
Port 503
Port-503
Port 504
Port-504
Port 505
Port-505
Port 506
Port-506
Port 507
Port-507
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