Run a netstat to see if port 6200 is listening:
For those managing systems or studying network security, the following steps are essential for defending against such vulnerabilities: vsftpd 208 exploit github install
Consider migrating to Pure-FTPd or ProFTPD, or better yet, switch to SFTP (via SSH) which is encrypted and more secure. Run a netstat to see if port 6200
chmod +x exploit.py python3 exploit.py
def check # ... end
The backdoor wasn't triggered. Ensure vsftpd is actually 2.0.8. Some CTFs change the banner. Fix: Re-check with nmap -sV -p 21 <IP> . If it says 2.0.8 but still fails, the backdoor may have been patched by the system admin. or better yet
The module handles the trigger and gives you a direct shell.