CVE-2023-27491

low-risk
Published 2023-04-04

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.

Do I need to act?

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0.01% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.4/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Envoyproxy

References (8)

Not Applicable https://datatracker.ietf.org/doc/html/rfc9113#section-8.3
Not Applicable https://datatracker.ietf.org/doc/html/rfc9114#section-4.3.1
Exploit https://github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rp
Not Applicable https://www.rfc-editor.org/rfc/rfc9110#section-5.6.2
Not Applicable https://datatracker.ietf.org/doc/html/rfc9113#section-8.3
Not Applicable https://datatracker.ietf.org/doc/html/rfc9114#section-4.3.1
Exploit https://github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rp
Not Applicable https://www.rfc-editor.org/rfc/rfc9110#section-5.6.2
26
/ 100
low-risk
Severity 21/34 · High
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal