Multiple heap-based buffer overflows in an ActiveX control in RealNetworks RealPlayer 11.0 through 11.1 and RealPlayer SP 1.0 through 1.1.4 allow remote attackers to execute arbitrary code via a long .smil argument to the (1) tfile, (2) pnmm, or (3) cdda protocol handler.
http://www.zerodayinitiative.com/advisories/ZDI-10-213/
http://www.securityfocus.com/bid/44144
http://service.real.com/realplayer/security/10152010_player/en/