An issue was discovered in SSHServerAPI.dll in Progress ipswitch WS_FTP Server 2018 before 8.6.1. Attackers have the ability to abuse a path traversal vulnerability using the SCP protocol. Attackers who leverage this flaw could also obtain remote code execution by crafting a payload that abuses the SITE command feature.
https://docs.ipswitch.com/WS_FTP_Server2018/ReleaseNotes/index.htm#49242.htm