CVE-2017-7756: Mozilla: Use-after-free and use-after-scope logging XHR header errors (MFSA 2017-16)

Severity: Critical

CVSS Score: 9.8

A use-after-free and use-after-scope vulnerability when logging errors from headers for XML HTTP Requests (XHR). This could result in a potentially exploitable crash. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.