Multiple buffer overflows in RealNetworks RealPlayer before 17.0.10.8 allow remote attackers to execute arbitrary code via a malformed (1) elst or (2) stsz atom in an MP4 file.
http://www.securitytracker.com/id/1030524
http://www.fortiguard.com/advisory/RealNetworks-RealPlayer-Memory-Corruption/
http://service.real.com/realplayer/security/06272014_player/en/