The remote host is vulnerable to a buffer overflow.
The remote host is running the Hummingbird Inetd FTP Server. It is reported that Hummingbird FTP Server is prone to a remote buffer in the XCWD command. An attacker exploiting this flaw would only need to be able to craft and send a query to the FTP server on its service port (usually 21)
Upgrade or patch according to vendor recommendations.