Mozilla firefox is vulnerable to denial of service (DoS). The vulnerability exists through a buffer overflow issue in plain text serializer.
lists.opensuse.org/opensuse-security-announce/2020-01/msg00000.html
lists.opensuse.org/opensuse-security-announce/2020-01/msg00001.html
access.redhat.com/errata/RHSA-2019:4108
access.redhat.com/errata/RHSA-2020:0292
access.redhat.com/errata/RHSA-2020:0295
access.redhat.com/security/updates/classification/#critical
bugzilla.mozilla.org/show_bug.cgi?id=1584170
security.gentoo.org/glsa/202003-02
security.gentoo.org/glsa/202003-10
usn.ubuntu.com/4241-1/
usn.ubuntu.com/4335-1/
www.mozilla.org/en-US/security/advisories/mfsa2019-37/
www.mozilla.org/security/advisories/mfsa2019-36/
www.mozilla.org/security/advisories/mfsa2019-37/
www.mozilla.org/security/advisories/mfsa2019-38/