Heap-based buffer overflow in the cook codec in RealNetworks RealPlayer 11.0 through 11.1, RealPlayer SP 1.0 through 1.1.5, and Linux RealPlayer 11.0.2.1744 allows remote attackers to execute arbitrary code via unspecified data in the initialization buffer.
http://www.zerodayinitiative.com/advisories/ZDI-10-279
http://www.securitytracker.com/id?1024861
http://service.real.com/realplayer/security/12102010_player/en/