The host is installed with Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 15.0, Thunderbird ESR 10.x before 10.0.7, and SeaMonkey before 2.12 and is prone to a use-after-free vulnerability. A flaw is present in the applications, which fail to handle vectors related to deletion of a fragment shader by its accessor. Successful exploitation could allow attackers to execute arbitrary code.