RealNetworks RealPlayer 11.x, 14.x, and 15.x before 15.02.71, and RealPlayer SP 1.0 through 1.1.5, allows remote attackers to execute arbitrary code via vectors involving a VIDOBJ_START_CODE code in a header within a video stream.
http://service.real.com/realplayer/security/02062012_player/en/