CVE-2020-16844

mediumpriority · track · 27EPSS 0.011 · 65 %ileEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
1.09% (65th) EPSS
CVSS 4.9 · medium
Is it mine?
18 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

In Istio 1.5.0 though 1.5.8 and Istio 1.6.0 through 1.6.7, when users specify an AuthorizationPolicy resource with DENY actions using wildcard suffixes (e.g. *-some-suffix) for source principals or namespace fields, callers will never be denied access, bypassing the intended policy.

01

remediations

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

A vendor fix is available.

  • Fixedservicemesh-0:1.1.7-1.el8.src as a component of OpenShift Service Mesh 1.1redhat_csaf

    The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/latest/service_mesh/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2020:3425
  • Fixedservicemesh-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/latest/service_mesh/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2020:3425
  • Fixedservicemesh-citadel-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/latest/service_mesh/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2020:3425
  • Fixedservicemesh-galley-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/latest/service_mesh/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2020:3425
  • Fixedservicemesh-istioctl-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/latest/service_mesh/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2020:3425
  • Fixedservicemesh-mixc-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/latest/service_mesh/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2020:3425
  • Fixedservicemesh-mixs-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/latest/service_mesh/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2020:3425
  • Fixedservicemesh-pilot-agent-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/latest/service_mesh/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2020:3425
  • Fixedservicemesh-pilot-discovery-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/latest/service_mesh/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2020:3425
  • Fixedservicemesh-sidecar-injector-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    The OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/latest/service_mesh/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2020:3425
  • Workaroundservicemesh-0:1.1.7-1.el8.src as a component of OpenShift Service Mesh 1.1redhat_csaf

    In regards to an AuthorizationPolicy for a TCP service, if using a DENY rule in the source principal (or namespace field) such as: apiVersion: security.istio.io/v1beta1 kind: AuthorizationPolicy ... spec: action: DENY rules: - from: - source: principals: - */ns/servicemesh Consider using an exact or suffix match instead such as: - /foo/bar/ns/servicemesh

  • Workaroundservicemesh-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    In regards to an AuthorizationPolicy for a TCP service, if using a DENY rule in the source principal (or namespace field) such as: apiVersion: security.istio.io/v1beta1 kind: AuthorizationPolicy ... spec: action: DENY rules: - from: - source: principals: - */ns/servicemesh Consider using an exact or suffix match instead such as: - /foo/bar/ns/servicemesh

  • Workaroundservicemesh-citadel-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    In regards to an AuthorizationPolicy for a TCP service, if using a DENY rule in the source principal (or namespace field) such as: apiVersion: security.istio.io/v1beta1 kind: AuthorizationPolicy ... spec: action: DENY rules: - from: - source: principals: - */ns/servicemesh Consider using an exact or suffix match instead such as: - /foo/bar/ns/servicemesh

  • Workaroundservicemesh-galley-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    In regards to an AuthorizationPolicy for a TCP service, if using a DENY rule in the source principal (or namespace field) such as: apiVersion: security.istio.io/v1beta1 kind: AuthorizationPolicy ... spec: action: DENY rules: - from: - source: principals: - */ns/servicemesh Consider using an exact or suffix match instead such as: - /foo/bar/ns/servicemesh

  • Workaroundservicemesh-istioctl-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    In regards to an AuthorizationPolicy for a TCP service, if using a DENY rule in the source principal (or namespace field) such as: apiVersion: security.istio.io/v1beta1 kind: AuthorizationPolicy ... spec: action: DENY rules: - from: - source: principals: - */ns/servicemesh Consider using an exact or suffix match instead such as: - /foo/bar/ns/servicemesh

  • Workaroundservicemesh-mixc-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    In regards to an AuthorizationPolicy for a TCP service, if using a DENY rule in the source principal (or namespace field) such as: apiVersion: security.istio.io/v1beta1 kind: AuthorizationPolicy ... spec: action: DENY rules: - from: - source: principals: - */ns/servicemesh Consider using an exact or suffix match instead such as: - /foo/bar/ns/servicemesh

  • Workaroundservicemesh-mixs-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    In regards to an AuthorizationPolicy for a TCP service, if using a DENY rule in the source principal (or namespace field) such as: apiVersion: security.istio.io/v1beta1 kind: AuthorizationPolicy ... spec: action: DENY rules: - from: - source: principals: - */ns/servicemesh Consider using an exact or suffix match instead such as: - /foo/bar/ns/servicemesh

  • Workaroundservicemesh-pilot-agent-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    In regards to an AuthorizationPolicy for a TCP service, if using a DENY rule in the source principal (or namespace field) such as: apiVersion: security.istio.io/v1beta1 kind: AuthorizationPolicy ... spec: action: DENY rules: - from: - source: principals: - */ns/servicemesh Consider using an exact or suffix match instead such as: - /foo/bar/ns/servicemesh

  • Workaroundservicemesh-pilot-discovery-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    In regards to an AuthorizationPolicy for a TCP service, if using a DENY rule in the source principal (or namespace field) such as: apiVersion: security.istio.io/v1beta1 kind: AuthorizationPolicy ... spec: action: DENY rules: - from: - source: principals: - */ns/servicemesh Consider using an exact or suffix match instead such as: - /foo/bar/ns/servicemesh

  • Workaroundservicemesh-sidecar-injector-0:1.1.7-1.el8.x86_64 as a component of OpenShift Service Mesh 1.1redhat_csaf

    In regards to an AuthorizationPolicy for a TCP service, if using a DENY rule in the source principal (or namespace field) such as: apiVersion: security.istio.io/v1beta1 kind: AuthorizationPolicy ... spec: action: DENY rules: - from: - source: principals: - */ns/servicemesh Consider using an exact or suffix match instead such as: - /foo/bar/ns/servicemesh

02

cvss

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

6.8
010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.9mediumAV:N/AC:M/Au:S/C:P/I:P/A:Nprimary · NVD / NIST USexploitability 6.8 · impact 4.9
v3.16.8mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Nprimary · NVD / NIST USexploitability 1.6 · impact 5.2
v3.16.8mediumAV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondary · FSTEC (BDU) RU
v3.16.8mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondary · OSV
v3.16.2mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)
v3.16.8mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondary · Red Hat Product Security US
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-284USCWE-284USCWE-284US
04

affected products (18)

Products and version ranges known to be affected.

05

advisories (2)

Vendor and ecosystem advisories describing this.

  • RHSA-2020:3425Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.1 security update2020-08-11csaf · 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 Moderate. 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.

  • GHSA-82mm-ffjr-h86cAuthorization bypass in Istio2022-02-15ghsa · osvUS

    In Istio 1.5.0 though 1.5.8 and Istio 1.6.0 through 1.6.7, when users specify an AuthorizationPolicy resource with DENY actions using wildcard suffixes (e.g. *-some-suffix) for source principals or namespace fields, callers will never be denied access, bypassing the intended policy. ### Specific Go Packages Affected istio.io/istio/pilot/pkg/security/authz/model/matcher

06

also known as (4)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bdunvdosvredhat_csafNVDCVE.orgMITRE
published 2020-10-01modified 2026-06-17
08

references (10)

External citations — patches, advisories, analysis.

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