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IPFYI
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20

FTP Data

Critical Risk

TCP — File Transfer

Port Overview

Port Number 20
Service Name FTP Data
Transport Protocol TCP
Category File Transfer
Security Risk Critical
Port Range Well-Known (0-1023)

What is Port 20?

FTP data transfer channel. Used in active mode FTP for the server to establish a data connection back to the client. Credentials and files are sent in plaintext.

TCP File Transfer Commonly Used

Security Considerations

Port 20 (FTP Data) is classified as critical risk. This port should not be exposed to the public internet. The service transmits data without encryption, making it vulnerable to eavesdropping, credential theft, and man-in-the-middle attacks.

Recommendation: Block this port at the firewall. Use encrypted alternatives (SSH, SFTP, HTTPS) instead.

Related Ports — File Transfer

21 FTP Control 69 TFTP 82 XFER Utility 115 SFTP (Simple FTP) 117 UUCP Path 139 NetBIOS Session 152 BFTP 191 Prospero
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