Observable Response Discrepancy in the SICK ICR890-4 could allow a remote attacker to identify valid usernames for the FTP server from the response given during a failed login attempt.
https://sick.com/.well-known/csaf/white/2023/sca-2023-0006.pdf
https://sick.com/.well-known/csaf/white/2023/sca-2023-0006.json