Provide references for CVE-2021-4248.
Where can I find more information about CVE-2021-4248?
References are available at: https://github.com/kapetan/dns/pull/88, https://github.com/kapetan/dns/releases/tag/v7.0.0, https://github.com/kapetan/dns/commit/cf7105aa2aae90d6656088fe5a8ee1d5730773b6, https://vuldb.com/?id.216188.