Stack-based buffer overflow in Internet Download Manager (IDM) before 5.19 allows remote attackers to execute arbitrary code via a crafted FTP URI that causes unspecified "test sequences" to be sent from client to server.
http://www.securityfocus.com/bid/39822
http://www.securityfocus.com/archive/1/511060/100/0/threaded
http://www.internetdownloadmanager.com/news.html