Internal Program Version: sshguard 2.5.1

SSHGuard can monitor one or more log files. Log messages are parsed,
line-by-line, for recognized patterns. If an attack, such as several login
failures within a few seconds, is detected, the offending IP is blocked.
Offenders are unblocked after a set interval, but can be semi-permanently
banned using the blacklist option.

SSHGuard recognizes attacks against:
- Apache
- Exim
- Gitea
- OpenSSH
- proftpd
- pure-ftpd
- Sendmail

https://www.sshguard.net/