Mozilla is vulnerable to denial of service (DoS). The vulnerability exists through memory safety bugs fixed in Firefox 75 and Firefox ESR 68.7.
access.redhat.com/errata/RHSA-2020:1406
access.redhat.com/security/updates/classification/#important
bugzilla.mozilla.org/buglist.cgi?bug_id=1572541%2C1620193%2C1620203
usn.ubuntu.com/4335-1/
www.mozilla.org/security/advisories/mfsa2020-12/
www.mozilla.org/security/advisories/mfsa2020-13/
www.mozilla.org/security/advisories/mfsa2020-14/