CVE-2023-27491 MEDIUM

CVE-2023-27491: Envoy forwards invalid Http2/Http3 downstream headers

Vendor Envoyproxy
Product envoy
Weakness CWE-20 · Input validation
Published April 4, 2023
Last update February 11, 2025
View on NVD All CVEs

CVSS base score

5.4/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 4, 2023 CVE published
February 11, 2025 Record updated