A use-after-free vulnerability can occur while editing events in form elements on a page, resulting in a potentially exploitable crash. This vulnerability affects Firefox ESR < 52.6 and Thunderbird < 52.6.
http://www.securityfocus.com/bid/102771
https://access.redhat.com/errata/RHSA-2018:0122
https://access.redhat.com/errata/RHSA-2018:0262
https://bugzilla.mozilla.org/show_bug.cgi?id=1418922
https://lists.debian.org/debian-lts-announce/2018/01/msg00030.html
https://lists.debian.org/debian-lts-announce/2018/01/msg00036.html
https://www.debian.org/security/2018/dsa-4096
https://www.debian.org/security/2018/dsa-4102
Source: MITRE
Published: 2018-06-11
Updated: 2018-08-07
Type: CWE-416
Base Score: 7.5
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 10
Severity: HIGH
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 3.9
Severity: CRITICAL