When aborting a SFTP connection, MobaXterm before v22.1 sends a hardcoded password to the server. The server treats this as an invalid login attempt which can result in a Denial of Service (DoS) for the user if services like fail2ban are used.
https://mobaxterm.mobatek.net/download-home-edition.html
https://docs.ssh-mitm.at/vulnerabilities/CVE-2022-38337.html