Is port 23 (Telnet) dangerous?

Port 23 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 23 be open on my firewall?

No, port 23 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 23 use?

Port 23 (Telnet) uses the TCP transport protocol and falls under the Remote Access category.

:23 (TCP)

Telnet

Critical Risiko

TCP — Remote Access

On this page

Ikhtisar Port

Nomor Port 23

Nama Layanan Telnet

Protokol Transport TCP

Kategori Remote Access

Risiko Keamanan Critical

Rentang Port Well-Known (0-1023)

Apa itu Port 23?

Telnet protocol. Provides unencrypted text-based remote login to network devices and servers. All data including passwords is sent in plaintext.

TCP Remote Access Umum Digunakan

Pertimbangan Keamanan

Port 23 (Telnet) 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.

Telnet

Ikhtisar Port

Apa itu Port 23?

Pertimbangan Keamanan

Protokol Terkait

Port Terkait — Remote Access

Istilah Terkait