CVE-2019-18802

CriticalCVSS 9.8/10Last 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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected software

No affected versions have been published.

Timeline

Published
Dec 13, 2019
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2019-18802: Critical severity, CVSS 9.8 | Vulnix