An issue was discovered in Envoy 1.14.0. There is a remotely exploitable crash for HTTP2 Metadata, because an empty METADATA map triggers a Reachable Assertion.
{ "cpes": [ "cpe:2.3:a:envoyproxy:envoy:1.14.6:*:*:*:*:*:*:*", "cpe:2.3:a:envoyproxy:envoy:1.15.3:*:*:*:*:*:*:*", "cpe:2.3:a:envoyproxy:envoy:1.16.2:*:*:*:*:*:*:*", "cpe:2.3:a:envoyproxy:envoy:1.17.1:*:*:*:*:*:*:*", "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*" ], "severity": "High" }