CVE-2019-18802

PoC —

CVSS 3.1

9.8 critical

EPSS

2%p84

Published

Dec 13, 2019 (Dec 13, 2019)

Modified

Jun 17, 2026

Description

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.

Vendors: envoyproxy
Products: envoy
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (2.5%)

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