The host is missing a critical security update according to Mozilla advisory, MFSA-2015-51. The update is required to fix an use-after-free vulnerability. A flaw is present in the applications, which fail to handle a document containing crafted text in conjunction with a Cascading Style Sheets (CSS) token sequence containing properties related to vertical text. Successful exploitation could allow attackers to execute arbitrary code or cause a denial of service (heap memory corruption).