512
rexec
Critical RiskTCP — Remote Access
Port Overview
Port Number
512
Service Name
rexec
Transport Protocol
TCP
Category
Remote Access
Security Risk
Critical
Port Range
Well-Known (0-1023)
What is Port 512?
Port 512 is assigned to rexec (Remote Process Execution). Transmits credentials in plaintext and has been superseded by SSH. Critical security risk.
TCP
Remote Access
Security Considerations
Port 512 (rexec) 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.