Array index error in RealNetworks RealPlayer 11.0 through 11.1, RealPlayer Enterprise 2.1.2, Mac RealPlayer 11.0 through 11.1, Linux RealPlayer 11.0.2.1744, and possibly HelixPlayer 1.0.6 and other versions, allows remote attackers to execute arbitrary code via a malformed Media Properties Header (aka MDPR) in a RealMedia file.