Memory safety bugs present in Firefox 60, Firefox ESR 60, and Firefox ESR 52.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 60, Thunderbird < 52.9, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.
http://www.securityfocus.com/bid/104555
https://access.redhat.com/errata/RHSA-2018:2112
https://access.redhat.com/errata/RHSA-2018:2113
https://access.redhat.com/errata/RHSA-2018:2251
https://access.redhat.com/errata/RHSA-2018:2252
https://lists.debian.org/debian-lts-announce/2018/06/msg00014.html
https://lists.debian.org/debian-lts-announce/2018/07/msg00013.html
https://security.gentoo.org/glsa/201810-01
https://security.gentoo.org/glsa/201811-13
https://usn.ubuntu.com/3705-1/
https://usn.ubuntu.com/3714-1/
https://usn.ubuntu.com/3749-1/
https://www.debian.org/security/2018/dsa-4244
https://www.mozilla.org/security/advisories/mfsa2018-15/
https://www.mozilla.org/security/advisories/mfsa2018-16/
https://www.mozilla.org/security/advisories/mfsa2018-17/
Source: MITRE
Published: 2018-10-18
Updated: 2018-12-06
Type: CWE-119
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