CVE-2017-5402 | Mozilla Firefox up to 51.x FontFace Object use after free (MFSA 2017-05 / Nessus ID 101437)
A vulnerability identified as critical has been detected in Mozilla Firefox up to 51.x. Affected by this vulnerability is an unknown functionality of the component FontFace Object Handler. The manipulation leads to use after free.
This vulnerability is uniquely identified as CVE-2017-5402. The attack is possible to be carried out remotely. No exploit exists.
You should upgrade the affected component.