CVE-2024-23324

Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata

At a glance

Severity: HIGH 8.6
EPSS: EPSS 0.60 % · percentile 49 (2026-10-27)
State: PUBLISHED
Published: 2024-02-09
Updated: 2024-08-19
Assigner: GitHub_M
NVD status: Modified

Description

Envoy is a high-performance edge/middle/service proxy. External authentication can be bypassed by downstream connections. Downstream clients can force invalid gRPC requests to be sent to ext_authz, circumventing ext_authz checks when failure_mode_allow is set to true. This issue has been addressed in released 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N	GitHub_M
CVSS 3.1	HIGH 8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N	NVD · security-advisories@github.com (Secondary)
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N	NVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

CWE-20

European references

ENISA EUVD · EUVD-2024-20839
GCVE · GCVE-0-2024-23324

CERT-FR advisories

CERTFR-2024-AVI-0156 — Multiples vulnérabilités dans les produits Tenable · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* ≥ 1.26.0 < 1.26.7
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* ≥ 1.27.0 < 1.27.3
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* ≥ 1.28.0 < 1.28.1
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* ≥ 1.29.0 < 1.29.1

Affected products

Product	Versions
envoyproxy · envoy	affected >= 1.29.0, < 1.29.1 ; affected >= 1.28.0, < 1.28.1 ; affected >= 1.27.0, < 1.27.3 ; affected < 1.26.7

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD