Multiple buffer overflows in RealOne and RealPlayer allow remote attackers to execute arbitrary code via (1) a Synchronized Multimedia Integration Language (SMIL) file with a long parameter, (2) a long long filename in a rtsp:// request, e.g. from a .m3u file, or (3) certain "Now Playing" options on a downloaded file with a long filename.
https://exchange.xforce.ibmcloud.com/vulnerabilities/10677
http://www.securityfocus.com/bid/6229
http://www.securityfocus.com/bid/6227
http://service.real.com/help/faq/security/bufferoverrun_player.html