Buffer overflow in NetFtpd for NetTerm 5.1.1 and earlier allows remote attackers to execute arbitrary code via a long USER command.
https://exchange.xforce.ibmcloud.com/vulnerabilities/20285
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-1326
http://www.vupen.com/english/advisories/2005/0407
http://www.securityfocus.com/bid/13396
http://www.securityfocus.com/archive/1/396959