The ATRAC codec in RealNetworks RealPlayer 11.x and 14.x through 14.0.7, RealPlayer SP 1.0 through 1.1.5, and Mac RealPlayer 12.x before 12.0.0.1703 does not properly decode samples, which allows remote attackers to execute arbitrary code via a crafted ATRAC audio file.
http://service.real.com/realplayer/security/02062012_player/en/