Directory traversal vulnerability in Transsoft FTP Broker before 5.5 allows attackers to (1) delete arbitrary files via DELETE, or (2) list arbitrary directories via LIST, via a .. (dot dot) in the file name.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6190
https://exchange.xforce.ibmcloud.com/vulnerabilities/6189
http://www.ftp-broker.com/cgibin/Pageexe.exe?H=4143&P=0&C=0
http://archives.neohapsis.com/archives/bugtraq/2001-02/0533.html