Buffer overflow in FTP server in QPC Software's QVT/Term Plus versions 4.2d and 4.3 and QVT/Net 4.3 allows remote attackers to cause a denial of service, and possibly execute arbitrary commands, via a long (1) user name or (2) password.
https://exchange.xforce.ibmcloud.com/vulnerabilities/3491
http://www.securityfocus.com/bid/796