Is port 502 (Modbus) dangerous?

Port 502 is classified as critical risk and should not be exposed to the public internet. It transmits data without encryption, making it vulnerable to eavesdropping and credential theft.

Should port 502 be open on my firewall?

No, port 502 should not be open to the public internet. Block it at the firewall and use encrypted alternatives such as SSH, SFTP, or HTTPS instead.

What transport protocol does port 502 use?

Port 502 (Modbus) uses the TCP transport protocol and falls under the Other category.

:502 (TCP)

Modbus

Critical Risiko

TCP — Other

On this page

Ikhtisar Port

Nomor Port 502

Nama Layanan Modbus

Protokol Transport TCP

Kategori Other

Risiko Keamanan Critical

Rentang Port Well-Known (0-1023)

Apa itu Port 502?

Port 502 is assigned to Modbus, widely used in industrial control systems (ICS), SCADA systems, and PLCs. No built-in authentication. Internet exposure is extremely dangerous.

TCP Other Umum Digunakan

Pertimbangan Keamanan

Port 502 (Modbus) diklasifikasikan sebagai risiko kritis. Port ini tidak boleh diekspos ke internet publik. Layanan ini mentransmisikan data tanpa enkripsi, sehingga rentan terhadap penyadapan, pencurian kredensial, dan serangan man-in-the-middle.

Rekomendasi: Blokir port ini di firewall. Gunakan alternatif terenkripsi (SSH, SFTP, HTTPS) sebagai gantinya.

Modbus

Ikhtisar Port

Apa itu Port 502?

Pertimbangan Keamanan

Port Terkait — Other

Istilah Terkait