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Fencer Vulns
high 8.6

CVE-2024-23324 json

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

published 2024-02-09 2 y ago modified 2026-09-08 2 mo ago also BIT-envoy-2024-23324 , EUVD-2024-20839 , GHSA-gq3v-vvhj-96j6

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami envoy 1.26.7, 1.27.3, 1.28.1, 1.29.1
  • envoyproxy envoy 1.26.7, 1.27.3, 1.28.1, 1.29.1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-23324 updated cvss 7.3

envoy: Ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata

  • Red Hat OpenShift Service Mesh 2 servicemesh-proxy, servicemesh-proxy-wasm, openshift-service-mesh/proxyv2-rhel8
    affected: no fix available

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
bitnami envoy
>=1.26.0, <1.26.7
>=1.27.0, <1.27.3
>=1.28.0, <1.28.1
>=1.29.0, <1.29.1
1.26.7
1.27.3
1.28.1
1.29.1

Affected products

  • envoyproxy envoy

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.