CVE-2023-27491

PoC —

CVSS 3.1

9.1 critical

EPSS

<1%p57

Published

Apr 4, 2023 (Apr 4, 2023)

Modified

Jun 17, 2026

Description

Envoy is an open source edge and service proxy designed for cloud-native applications. Compliant HTTP/1 service should reject malformed request lines. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, There is a possibility that non compliant HTTP/1 service may allow malformed requests, potentially leading to a bypass of security policies. This issue is fixed in versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9.

Vendors: envoyproxy
Products: envoy
Weakness: CWE-20, CWE-444
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

NVD CVE.org GitHub PoCs EPSS (0.9%)

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