CompleteFTPService.exe in the server in EnterpriseDT CompleteFTP before 12.1.4 allows Remote Code Execution by leveraging a Windows user account that has SSH access. The exec command is always run as SYSTEM.
https://github.com/RhinoSecurityLabs/CVEs/tree/master/CVE-2019-16864
https://enterprisedt.com/products/completeftp/doc/guide/html/history.html