Provide references for CVE-2021-33038.
Where can I find more information about CVE-2021-33038?
References are available at: https://gitlab.com/mailman/hyperkitty/-/issues/380, https://gitlab.com/mailman/hyperkitty/-/commit/9025324597d60b2dff740e49b70b15589d6804fa, https://www.debian.org/security/2021/dsa-4922, https://techblog.wikimedia.org/2021/06/11/discovering-and-fixing-cve-2021-33038-in-mailman3/.