Provide references for CVE-2021-4000.
Where can I find more information about CVE-2021-4000?
References are available at: https://huntr.dev/bounties/e4d803e0-3104-432c-80b3-34bc453c8962, https://github.com/star7th/showdoc/commit/c7f10033eba5f2b5a537f9af9ba2379138e67138.