CVE-2017-5460: Mozilla: Use-after-free in frame selection (MFSA 2017-11, MFSA 2017-12)

Severity: Critical

CVSS Score: 9.8

A use-after-free vulnerability in frame selection triggered by a combination of malicious script content and key presses by a user. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.