The remote host is vulnerable to a remote buffer overflow attack.
The remote host is running Serv-U File Server, an FTP server for Windows. The installed version is earlier than 220.127.116.11. Such versions are potentially affected by a remote buffer overflow vulnerability caused by a boundary error in a function when processing a hexadecimal representation of a string using a TEA decoding algorithm.
Upgrade to Serv-U version 18.104.22.168 or later.