EFTP tells if a given file exists

The remote FTP server can be used to determine if a given file exists on the remote host or not, by adding dot-dot-slashes in front of them. For instance, it is possible to determine the presence of \autoexec.bat by using the command SIZE or MDTM on ../../../../autoexec.bat An attacker may use this flaw to gain more knowledge about this host, such as its file layout. This flaw is specially useful when used with other vulnerabilities.
update your EFTP server to or change it