CVE-2021-31921

mediumpriority · track · 40OT risk · elevatedEPSS 0.015 · 73 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.45% (73rd) EPSS

CVSS 6.8 · medium

Is it mine?

50 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · redhat_csaf

EPSS · scored 2026-10-27

Istio before 1.8.6 and 1.9.x before 1.9.5 contains a remotely exploitable vulnerability where an external client can access unexpected services in the cluster, bypassing authorization checks, when a gateway is configured with AUTO_PASSTHROUGH routing configuration.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedservicemesh-0:2.0.5-3.el8.ppc64le as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-0:2.0.5-3.el8.s390x as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-0:2.0.5-3.el8.src as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-0:2.0.5-3.el8.x86_64 as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-istioctl-0:2.0.5-3.el8.ppc64le as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-istioctl-0:2.0.5-3.el8.s390x as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-istioctl-0:2.0.5-3.el8.x86_64 as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-mixc-0:2.0.5-3.el8.ppc64le as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-mixc-0:2.0.5-3.el8.s390x as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-mixc-0:2.0.5-3.el8.x86_64 as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-mixs-0:2.0.5-3.el8.ppc64le as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-mixs-0:2.0.5-3.el8.s390x as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-mixs-0:2.0.5-3.el8.x86_64 as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-pilot-agent-0:2.0.5-3.el8.ppc64le as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-pilot-agent-0:2.0.5-3.el8.s390x as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-pilot-agent-0:2.0.5-3.el8.x86_64 as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-pilot-discovery-0:2.0.5-3.el8.ppc64le as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-pilot-discovery-0:2.0.5-3.el8.s390x as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-pilot-discovery-0:2.0.5-3.el8.x86_64 as a component of OpenShift Service Mesh 2.0redhat_csaf
The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.7/service_mesh/v2x/servicemesh-release-notes.html
https://access.redhat.com/errata/RHSA-2021:2061
Fixedservicemesh-0:1.1.15-4.el8.ppc64le as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-0:1.1.15-4.el8.s390x as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-0:1.1.15-4.el8.src as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-0:1.1.15-4.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-citadel-0:1.1.15-4.el8.ppc64le as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-citadel-0:1.1.15-4.el8.s390x as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-citadel-0:1.1.15-4.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-galley-0:1.1.15-4.el8.ppc64le as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-galley-0:1.1.15-4.el8.s390x as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-galley-0:1.1.15-4.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-istioctl-0:1.1.15-4.el8.ppc64le as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-istioctl-0:1.1.15-4.el8.s390x as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-istioctl-0:1.1.15-4.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-mixc-0:1.1.15-4.el8.ppc64le as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-mixc-0:1.1.15-4.el8.s390x as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-mixc-0:1.1.15-4.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-mixs-0:1.1.15-4.el8.ppc64le as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-mixs-0:1.1.15-4.el8.s390x as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-mixs-0:1.1.15-4.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-pilot-agent-0:1.1.15-4.el8.ppc64le as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-pilot-agent-0:1.1.15-4.el8.s390x as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-pilot-agent-0:1.1.15-4.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-pilot-discovery-0:1.1.15-4.el8.ppc64le as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-pilot-discovery-0:1.1.15-4.el8.s390x as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-pilot-discovery-0:1.1.15-4.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-sidecar-injector-0:1.1.15-4.el8.ppc64le as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-sidecar-injector-0:1.1.15-4.el8.s390x as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085
Fixedservicemesh-sidecar-injector-0:1.1.15-4.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:2085

cvss

Technical severity, 0–10. One row per scoring source.

10.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.8–10

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.110criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · Red Hat Product Security US

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-862USprimaryCWE-863US

affected products (50)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
istio istio< 1.8.6nvdUScpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*
istio istio1.9.0 → 1.9.5nvdUScpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*
servicemesh-0:1.1.15-4.el8.ppc64le as a component of OpenShift Service Mesh 1.1all versionsfixedredhat_csafUS
servicemesh-0:1.1.15-4.el8.s390x as a component of OpenShift Service Mesh 1.1all versionsfixedredhat_csafUS
servicemesh-0:1.1.15-4.el8.src as a component of OpenShift Service Mesh 1.1all versionsfixedredhat_csafUS
servicemesh-0:1.1.15-4.el8.x86_64 as a component of OpenShift Service Mesh 1.1all versionsfixedredhat_csafUS
servicemesh-0:2.0.5-3.el8.ppc64le as a component of OpenShift Service Mesh 2.0all versionsfixedredhat_csafUS
servicemesh-0:2.0.5-3.el8.s390x as a component of OpenShift Service Mesh 2.0all versionsfixedredhat_csafUS
servicemesh-0:2.0.5-3.el8.src as a component of OpenShift Service Mesh 2.0all versionsfixedredhat_csafUS
servicemesh-0:2.0.5-3.el8.x86_64 as a component of OpenShift Service Mesh 2.0all versionsfixedredhat_csafUS
servicemesh-citadel-0:1.1.15-4.el8.ppc64le as a component of OpenShift Service Mesh 1.1all versionsfixedredhat_csafUS
servicemesh-citadel-0:1.1.15-4.el8.s390x as a component of OpenShift Service Mesh 1.1all versionsfixedredhat_csafUS
servicemesh-citadel-0:1.1.15-4.el8.x86_64 as a component of OpenShift Service Mesh 1.1all versionsfixedredhat_csafUS
servicemesh-galley-0:1.1.15-4.el8.ppc64le as a component of OpenShift Service Mesh 1.1all versionsfixedredhat_csafUS
servicemesh-galley-0:1.1.15-4.el8.s390x as a component of OpenShift Service Mesh 1.1all versionsfixedredhat_csafUS
servicemesh-galley-0:1.1.15-4.el8.x86_64 as a component of OpenShift Service Mesh 1.1all versionsfixedredhat_csafUS
servicemesh-istioctl-0:1.1.15-4.el8.ppc64le as a component of OpenShift Service Mesh 1.1all versionsfixedredhat_csafUS
servicemesh-istioctl-0:1.1.15-4.el8.s390x as a component of OpenShift Service Mesh 1.1all versionsfixedredhat_csafUS
servicemesh-istioctl-0:1.1.15-4.el8.x86_64 as a component of OpenShift Service Mesh 1.1all versionsfixedredhat_csafUS

showing 20 of 50

advisories (2)

Vendor and ecosystem advisories describing this.

RHSA-2021:2061Red Hat Security Advisory: Red Hat OpenShift Service Mesh 2.0.5 security update2021-05-20csaf · redhat_csafUS
An update for servicemesh is now available for OpenShift Service Mesh 2.0. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
RHSA-2021:2085Red Hat Security Advisory: servicemesh security update2021-05-20csaf · redhat_csafUS
An update for servicemesh is now available for OpenShift Service Mesh 1.1. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd redhat_csaf NVD CVE.org MITRE

published 2021-06-02modified 2026-06-17

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references (8)

External citations — patches, advisories, analysis.

scry

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