Regularly check for and apply patches to your FTP server software. This includes not just the FTP server itself but also the operating system and any other software running on the server.
Applying is excellent, but it should be part of a layered defense: 10161oo244 icc ftp server patched
sudo systemctl stop icc-ftp
The server accepted unlimited anonymous connections, making it an ideal vector for DoS (Denial of Service) attacks that could halt production lines. Vulnerability Report: 10161oo244 ICC FTP Server Patched Keep