Mozilla developers reported memory safety bugs present in Firefox 71 and Firefox ESR 68.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1507180%2C1595470%2C1598605%2C1601826
https://www.mozilla.org/security/advisories/mfsa2020-01/
https://www.mozilla.org/security/advisories/mfsa2020-02/
https://seclists.org/bugtraq/2020/Jan/12
https://lists.debian.org/debian-lts-announce/2020/01/msg00005.html
https://www.debian.org/security/2020/dsa-4600
https://usn.ubuntu.com/4234-1/
https://seclists.org/bugtraq/2020/Jan/18
https://access.redhat.com/errata/RHSA-2020:0086
https://access.redhat.com/errata/RHSA-2020:0085
https://access.redhat.com/errata/RHSA-2020:0111
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00029.html
https://access.redhat.com/errata/RHSA-2020:0123
https://access.redhat.com/errata/RHSA-2020:0120
https://access.redhat.com/errata/RHSA-2020:0127
https://usn.ubuntu.com/4241-1/
https://www.debian.org/security/2020/dsa-4603
https://seclists.org/bugtraq/2020/Jan/26
https://lists.debian.org/debian-lts-announce/2020/01/msg00016.html
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00043.html
https://access.redhat.com/errata/RHSA-2020:0295
https://access.redhat.com/errata/RHSA-2020:0292
Source: MITRE
Published: 2020-01-08
Updated: 2022-04-08
Type: CWE-787
Base Score: 6.8
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 8.8
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 2.8
Severity: HIGH