CVE-2023-27491
Envoy forwards invalid Http2/Http3 downstream headers
9.1
CRITICAL
CVSS 3.1
EPSS 0.01%
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.
How to fix CVE-2023-27491
To remediate CVE-2023-27491, upgrade the affected package to a fixed version below.
- —upgrade to 1.22.9 or later
Is CVE-2023-27491 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1.22.9, >= 1.23.0, < 1.23.6, >= 1.24.0, < 1.24.4, >= 1.25.0, < 1.25.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |