Heap-based buffer overflow in RealNetworks RealPlayer 11.0 through 11.1, RealPlayer SP 1.0 through 1.1.4, RealPlayer Enterprise 2.1.2, and Mac RealPlayer 11.0 through 12.0.0.1444 allows remote attackers to have an unspecified impact via a crafted AAC file.
http://www.securitytracker.com/id?1024861
http://service.real.com/realplayer/security/12102010_player/en/