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VID 16013
Severity 20
Port 21
Protocol TCP
Class FTP
Detailed Description It is possible to determine the existence of a user on the remote system by issuing the command CWD ~<username>, like :

CWD ~adm

A cracker may use this to determine the existence of known to be vulnerable accounts (like guest) or to determine which system you are running.

* References:
http://online.securityfocus.com/bid/2564
http://cgi.nessus.org/plugins/dump.php3?id=10082
Recommendation Inform your vendor, and ask for a patch, or change your FTP server
Related URL (CVE)
Related URL (SecurityFocus)
Related URL (ISS)