The host is installed with Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8, 38.x before 38.1, Thunderbird before 31.8 or 38.x before 38.1 and is prone to an unspecified vulnerability. A flaw is present in the applications, which read data from uninitialized memory locations. Successful exploitation could allow attackers to cause unspecified impact.