CVE-2019-18802: envoy: malformed request header may cause bypass of route matchers resulting in escalation of privileges or information disclosure

Severity: Critical

CVSS Score: 9.8

An issue was discovered in Envoy 1.12.0. An untrusted remote client may send an HTTP header (such as Host) with whitespace after the header content. Envoy will treat "header-value " as a different string from "header-value" so for example with the Host header "example.com " one could bypass "example.com" matchers.