rjrmrpln.dll in RealNetworks RealPlayer 11.0 through 11.1, RealPlayer SP 1.0 through 1.1.4, and RealPlayer Enterprise 2.1.2 does not properly validate file contents that are used during interaction with a heap buffer, which allows remote attackers to execute arbitrary code via crafted Name Value Property (NVP) elements in logical streams in a media file.