CVE-2017-7819 | Mozilla Firefox up to 55 Design Mode use after free (MFSA 2017-21 / Nessus ID 108820)
A vulnerability identified as critical has been detected in Mozilla Firefox up to 55. Impacted is an unknown function of the component Design Mode. This manipulation causes use after free.
This vulnerability is handled as CVE-2017-7819. The attack can be initiated remotely. There is not any exploit available.
You should upgrade the affected component.