Vulnerability Report

CVE-2023-27491

Title: Envoy HTTP/1 Malformed Request Bypass

Security Policy Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2023-27491.

CWE Category CWE-444
Published Date Apr 04, 2023
Modified Date Nov 21, 2024
Exploit Status Not Found
Score 5.4 CVSS v3.1
Exploit Probability (EPSS)
0.87%

Vulnerability Summary

CVE-2023-27491: 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.

Impacted Vendors

E
enphase 1
E
envoyproxy 1

Reference Links

https://datatracker.ietf.org/doc/html/rfc9113#section-8.3 https://datatracker.ietf.org/doc/html/rfc9114#section-4.3.1 https://github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rp https://www.rfc-editor.org/rfc/rfc9110#section-5.6.2 https://datatracker.ietf.org/doc/html/rfc9113#section-8.3 https://datatracker.ietf.org/doc/html/rfc9114#section-4.3.1 https://github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rp https://www.rfc-editor.org/rfc/rfc9110#section-5.6.2
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
5.4
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
REQUIRED
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CVSS v3.1
Source Entity [email protected]
Severity CRITICAL
9.1
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2023-27491 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction REQUIRED
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected Stack

No specific products linked.