Provide references for CVE-2019-20454.
Where can I find more information about CVE-2019-20454?
References are available at: https://bugs.exim.org/show_bug.cgi?id=2421, https://bugs.php.net/bug.php?id=78338, https://vcs.pcre.org/pcre2?view=revision&revision=1092, https://bugzilla.redhat.com/show_bug.cgi?id=1735494, https://security.gentoo.org/glsa/202006-16, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OQRAHYHLRNMBTPR3KXVM27NSZP3KTOPI/, https://lists.debian.org/debian-lts-announce/2023/03/msg00014.html.