Unspecified vulnerability in Serv-U File Server 7.0.0.1, and other versions before 7.2.0.1, allows remote authenticated users to cause a denial of service (daemon crash) via an SSH session with SFTP commands for directory creation and logging.
https://exchange.xforce.ibmcloud.com/vulnerabilities/44537
http://www.serv-u.com/releasenotes/