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Commonly Hacked Ports

Part of the Hacking For Dummies Cheat Sheet

Common ports, such as TCP port 80 (HTTP), may be locked down — but other ports may get overlooked and be vulnerable to hackers. In your security tests, be sure to check these commonly hacked TCP and UDP ports:

  • TCP port 21 - FTP (File Transfer Protocol)

  • TCP port 22 – SSH (Secure Shell)

  • TCP port 23 - telnet

  • TCP port 25 - SMTP (Simple Mail Transfer Protocol)

  • TCP and UDP port 53 - DNS (Domain Name System)

  • TCP port 443 - HTTP (Hypertext Transport Protocol) and HTTPS (HTTP over SSL)

  • TCP port 110 - POP3 (Post Office Protocol version 3)

  • TCP and UDP port 135 - Windows RPC

  • TCP and UDP ports 137–139 - Windows NetBIOS over TCP/IP

  • TCP port 1433 and UDP port 1434 – Microsoft SQL Server

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