CVE-2017-7793: Mozilla: Use-after-free with Fetch API (MFSA 2017-22)

Severity: Critical

CVSS Score: 9.8

A use-after-free vulnerability can occur in the Fetch API when the worker or the associated window are freed when still in use, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.