Heap-based buffer overflow in RealNetworks RealPlayer before 16.0.1.18 and RealPlayer SP 1.0 through 1.1.5 allows remote attackers to execute arbitrary code via a malformed MP4 file.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2013-1777
http://service.real.com/realplayer/security/03152013_player/en/