CVE-2017-7800: Mozilla: Use-after-free in WebSockets during disconnection (MFSA 2017-19)

Severity: Critical

CVSS Score: 9.8

A use-after-free vulnerability can occur in WebSockets when the object holding the connection is freed before the disconnection operation is finished. This results in an exploitable crash. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.