Heap-based buffer overflow in RealNetworks RealPlayer 11.0 through 11.1 and RealPlayer SP 1.0 through 1.1.5 allows remote web servers to execute arbitrary code via a long Server header in a response to an HTTP request that occurs during parsing of a RealPix file.
http://www.zerodayinitiative.com/advisories/ZDI-10-282
http://www.securitytracker.com/id?1024861
http://service.real.com/realplayer/security/12102010_player/en/