The host is installed with Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 10.x before 10.0.12 and 17.x before 17.0.2 or SeaMonkey before 2.15 and is prone to use-after-free vulnerability. A flaw is present in the applications, which fail to handle vectors that involve the triggering of garbage collection after memory allocation for listener objects. Successful exploitation allows remote attackers to execute arbitrary code.