The host is running KnFTPd Server and is prone to multiple buffer overflow vulnerabilities.
Successful exploitation will allow remote attackers to execute arbitrary code on the system or cause the application to crash. Impact Level: System/Application
No solution or patch was made available for at least one year since disclosure of this vulnerability. Likely none will be provided anymore. General solution options are to upgrade to a newer release, disable respective features, remove the product or replace the product by another one.
The flaws are due to an error while processing the multiple commands, which can be exploited to cause a buffer overflow by sending a command with specially-crafted an overly long parameter.
KnFTPd Server Version 1.0.0