Browsing Category

Common ports and services

Port 25 – SMTP

SMTP (Simple Mail Transfer Protocol) is a TCP/IP protocol used in sending and receiving e-mail. It is normally worked with one of two other protocols, POP3 or IMAP, that allow the user to save messages in a server mailbox and download them…

Port 23 – Telnet

Telnet protocol considered insecure because it doesn't encrypt data. The protocol is old and is affected by various Code-Execution vulnerabilities, might be worth checking exploit-db.com for that. Brute force Telnet with Nmap: nmap -p…

Port 22 – SSH

SSH is a very popular method to securely communicate with a remote host. SSH is old and basic technology so most recent versions are well secured. You can discover out the version of the SSH by scanning it with nmap or by connecting with it…

Port 21 – FTP

FTP is a service that is usually used in Web Servers from admins for accessing the data remotely. So it's a fact that you will find this service in one of our clients' systems during penetration testing. Connect to the ftp-server to…