A potential vulnerability was found in 32-bit builds where an integer overflow during the conversion of scripts to an internal UTF-16 representation could result in allocating a buffer too small for the conversion. This leads to a possible out-of-bounds write. *Note: 64-bit builds are not vulnerable to this issue.*. This vulnerability affects Firefox < 63, Firefox ESR < 60.3, and Thunderbird < 60.3.
http://www.securityfocus.com/bid/105718
http://www.securityfocus.com/bid/105769
http://www.securitytracker.com/id/1041944
https://access.redhat.com/errata/RHSA-2018:3005
https://access.redhat.com/errata/RHSA-2018:3006
https://access.redhat.com/errata/RHSA-2018:3531
https://access.redhat.com/errata/RHSA-2018:3532
https://bugzilla.mozilla.org/show_bug.cgi?id=1495011
https://lists.debian.org/debian-lts-announce/2018/11/msg00008.html
https://lists.debian.org/debian-lts-announce/2018/11/msg00011.html
https://security.gentoo.org/glsa/201811-04
https://security.gentoo.org/glsa/201811-13
https://usn.ubuntu.com/3801-1/
https://usn.ubuntu.com/3868-1/
https://www.debian.org/security/2018/dsa-4324
https://www.debian.org/security/2018/dsa-4337
https://www.mozilla.org/security/advisories/mfsa2018-26/
Source: MITRE
Published: 2019-02-28
Updated: 2020-08-24
Type: CWE-787
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH