Provide references for CVE-2021-3967.
Where can I find more information about CVE-2021-3967?
References are available at: https://huntr.dev/bounties/2928a625-0467-4a0a-b4e2-e27322786686, https://github.com/zulip/zulip/commit/d5db254ca8167995a1654d1c45ffc74b2fade39a.