Provide references for CVE-2020-15011.
Where can I find more information about CVE-2020-15011?
References are available at: https://bugs.launchpad.net/mailman/+bug/1877379, https://lists.debian.org/debian-lts-announce/2020/06/msg00036.html, https://usn.ubuntu.com/4406-1/, https://lists.debian.org/debian-lts-announce/2020/07/msg00007.html, http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00047.html, http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00063.html, https://www.debian.org/security/2021/dsa-4991.