CVE-2019-18801 (CVSS score 9.0, Critical): An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1.
CVE-2019-18802 (CVSS score 7.5, High): A request header with trailing whitespace may cause route matchers or access controls to be bypassed, resulting in escalation of privileges or information disclosure.
CVE-2019-18838 (CVSS score 7.5, High): Malformed HTTP request without the Host header may cause abnormal termination of the Envoy process.