← Port Encyclopedia
20
FTP-Data
TCP
File Transfer
High Risk
FTP data transfer channel — transmits files in cleartext, credentials can be sniffed
🔍 How to Scan Port 20
nmap -sV -p 20 target
nmap -sV -sC --script=banner -p 20 target
nc -zv target 20
🛡️ Security Considerations
- Scan port 20 with
nmap -sVto identify the exact service and version - If FTP-Data is not needed, close or firewall this port immediately
- Check for default credentials if a management interface runs on this port
- Use
searchsploit ftp-datato find known exploits - Monitor traffic on port 20 with Wireshark or tcpdump for anomalies
- Ensure the service is patched to the latest version to prevent known CVE exploitation