VULNERABILITY INTELLIGENCE
CVE-2019-18802
CVSS score9.8 CRITICAL
EPSS probability2.46%
CISA KEVNot currently listed
Published2019-12-13
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
Primary references
- cve@mitre.org
- cve@mitre.org — Product
- cve@mitre.org — Patch
- cve@mitre.org — Exploit, Third Party Advisory
- cve@mitre.org
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108 — Product
- af854a3a-2127-422b-91ae-364da2661108 — Patch
- af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory
- af854a3a-2127-422b-91ae-364da2661108