Provide references for CVE-2021-21378.
Where can I find more information about CVE-2021-21378?
References are available at: https://github.com/envoyproxy/envoy/security/advisories/GHSA-4996-m8hf-hj27, https://github.com/envoyproxy/envoy/pull/15194, https://github.com/envoyproxy/envoy/commit/ea39e3cba652bcc4b11bb0d5c62b017e584d2e5a.