Provide references for CVE-2021-21311.
Where can I find more information about CVE-2021-21311?
References are available at: https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6, https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf, https://packagist.org/packages/vrana/adminer, https://github.com/vrana/adminer/commit/ccd2374b0b12bd547417bf0dacdf153826c83351, https://lists.debian.org/debian-lts-announce/2021/03/msg00002.html.