Provide references for CVE-2021-21333.
Where can I find more information about CVE-2021-21333?
References are available at: https://github.com/matrix-org/synapse/releases/tag/v1.27.0, https://github.com/matrix-org/synapse/pull/9200, https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df, https://github.com/matrix-org/synapse/security/advisories/GHSA-c5f8-35qr-q4fm, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/.