CVE-2024-23326

Envoy incorrectly accepts HTTP 200 response for entering upgrade mode

Published Jun 4, 2024 CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
Description
Envoy is a cloud-native, open source edge and service proxy. A theoretical request smuggling vulnerability exists through Envoy if a server can be tricked into adding an upgrade header into a response. Per RFC https://www.rfc-editor.org/rfc/rfc7230#section-6.7 a server sends 101 when switching protocols. Envoy incorrectly accepts a 200 response from a server when requesting a protocol upgrade, but 200 does not indicate protocol switch. This opens up the possibility of request smuggling through Envoy if the server can be tricked into adding the upgrade header to the response.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2024-20841 Envoy is a cloud-native, open source edge and service proxy. A theoretical request smuggling vulnerability exists through Envoy if a server can be tricked into adding an upgrade header into a response. Per RFC https://www.rfc-editor.org/rfc/rfc7230#section-6.7 a server sends 101 when switching protocols. Envoy incorrectly accepts a 200 response from a server when requesting a protocol upgrade, but 200 does not indicate protocol switch. This opens up the possibility of request smuggling through Envoy if the server can be tricked into adding the upgrade header to the response.
History
Type Values Removed Values Added
Metrics epss

{'score': 0.00044}

epss

{'score': 0.00043}

Type Values Removed Values Added
Metrics epss

{'score': 0.00025}

epss

{'score': 0.00044}

Type Values Removed Values Added
First Time appeared Redhat
Redhat service Mesh
CPEs cpe:/a:redhat:service_mesh:2.5::el8
Vendors & Products Redhat
Redhat service Mesh
Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Aug 1, 2024, 10:59 PM
Reserved
Jan 15, 2024, 3:19 PM
Status
Modified
Published
Jun 4, 2024, 9:15 PM
Modified
Jun 17, 2026, 7:12 AM
Severity
Moderate
Public date
Jun 4, 2024, 12:00 AM