CVE-2023-27491: Envoy forwards invalid Http2/Http3 downstream headers
First published: Thu Mar 16 2023(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Envoyproxy Envoy | <1.22.9 | |
| Envoyproxy Envoy | >=1.23.0<1.23.6 | |
| Envoyproxy Envoy | >=1.24.0<1.24.4 | |
| Envoyproxy Envoy | >=1.25.0<1.25.3 |
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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://access.redhat.com/errata/RHSA-2023:4623
- https://access.redhat.com/security/cve/cve-2023-27491
- https://bugzilla.redhat.com/show_bug.cgi?id=2179138
Frequently Asked Questions
What is CVE-2023-27491?
CVE-2023-27491 is a vulnerability in Envoy, an open source edge and service proxy, where non-compliant HTTP/1 services may allow malformed requests, potentially leading to security issues.
How severe is CVE-2023-27491?
CVE-2023-27491 has a severity score of 9.1, which is considered critical.
Which versions of Envoy are affected by CVE-2023-27491?
Envoy versions prior to 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9 are affected by CVE-2023-27491.
How can I fix CVE-2023-27491?
To fix CVE-2023-27491, you should update Envoy to version 1.26.0, 1.25.3, 1.24.4, 1.23.6, or 1.22.9, or newer.
Where can I find more information about CVE-2023-27491?
More information about CVE-2023-27491 can be found at the following references: [link1], [link2], [link3].
- collector/nvd-index
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- vendor/envoyproxy
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- version/envoyproxy envoy/1.23.0
- version/envoyproxy envoy/1.24.0
- version/envoyproxy envoy/1.25.0