Home/CVE/Envoy is an open source edge and service proxy designed for cloud-native applications. Compliant HTTP/1 service should r
CVE

CVE-2023-27491

Envoy is an open source edge and service proxy designed for cloud-native applications. Compliant HTTP/1 service should r

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.

MEDIUM · CVSS 5.4 EPSS 0.00015
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-20Improper Input Validation
CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
▤

Affected Products & Versions

4
envoyproxy envoy< 1.22.9
envoyproxy envoy>= 1.23.0 and < 1.23.6
envoyproxy envoy>= 1.24.0 and < 1.24.4
envoyproxy envoy>= 1.25.0 and < 1.25.3
⚠

Public Exploits & PoCs

1
pocgithub.com · GHSA-5jmv-cw9p-f9rpgithub.com
▣

Scoring & Timeline

5.4
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD04 Apr 2023 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
rhsaRHSA-2023:4623Important
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://datatracker.ietf.org/doc/html/rfc9113#section-8.3Not Applicable
https://datatracker.ietf.org/doc/html/rfc9114#section-4.3.1Not Applicable
https://www.rfc-editor.org/rfc/rfc9110#section-5.6.2Not Applicable
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