Mozilla Firefox is vulnerable to denial of service (DoS). It causes a Stack buffer overflow in HKDF output.
access.redhat.com/errata/RHSA-2019:3193
access.redhat.com/security/updates/classification/#critical
bugzilla.mozilla.org/show_bug.cgi?id=1577953
security.gentoo.org/glsa/202003-10
usn.ubuntu.com/4335-1/
www.mozilla.org/security/advisories/mfsa2019-33/
www.mozilla.org/security/advisories/mfsa2019-34/
www.mozilla.org/security/advisories/mfsa2019-35/