The OpenURLInDefaultBrowser method in RealNetworks RealPlayer 11.0 through 11.1 and 14.0.0 through 14.0.2, and RealPlayer SP 1.0 through 1.1.5, launches a default handler for the filename specified in the first argument, which allows remote attackers to execute arbitrary code via a .rnx filename corresponding to a crafted RNX file.