vsftpd

vsftpd advertises its version as part of its FTP communication. The version can be removed completely. As covered in the Version banners may not be precise section, this could lead to false positives from network vulnerability management scanners.

Disabling the version advertised by vsftpd can be achieved with the ftpd_banner directive:

echo "ftpd_banner=FTP server" | sudo tee -a /etc/vsftpd.conf
sudo systemctl reload vsftpd.service

Please note that this modifies the configuration file distributed by the package, which could interfere with subsequent unattended upgrades.