Provide references for CVE-2021-3994.
Where can I find more information about CVE-2021-3994?
References are available at: https://huntr.dev/bounties/be7f211d-4bfd-44fd-91e8-682329906fbd, https://github.com/django-helpdesk/django-helpdesk/commit/a22eb0673fe0b7784f99c6b5fd343b64a6700f06.