Format string vulnerability in Dream FTP 1.02 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via format string specifiers in the username.
https://exchange.xforce.ibmcloud.com/vulnerabilities/15070
http://www.security-protocols.com/modules.php?name=News&file=article&sid=1722
http://marc.info/?l=bugtraq&m=107656166402882&w=2
http://lists.grok.org.uk/pipermail/full-disclosure/2004-February/016871.html