CVE-2021-39156

mediumpriority · track · 40OT risk · elevatedEPSS 0.012 · 67 %ileexploit · PoCEUUS
grimoire priorityP1 · Urgent
Exploitable?
Public exploit
1 exploit · PoC
Likely / severe?
1.18% (67th) EPSS
CVSS 5 · medium
Is it mine?
64 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

Istio is an open source platform for providing a uniform way to integrate microservices, manage traffic flow across microservices, enforce policies and aggregate telemetry data. Istio 1.11.0, 1.10.3 and below, and 1.9.7 and below contain a remotely exploitable vulnerability where an HTTP request with `#fragment` in the path may bypass Istio’s URI path based authorization policies. Patches are available in Istio 1.11.1, Istio 1.10.4 and Istio 1.9.8. As a work around a Lua filter may be written to normalize the path.

01

remediations

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

A vendor fix is available.

  • Fixedservicemesh-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-istioctl-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-istioctl-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-istioctl-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-mixc-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-mixc-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-mixc-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-mixs-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-mixs-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-mixs-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-pilot-agent-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-pilot-agent-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-pilot-agent-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-pilot-discovery-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-pilot-discovery-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-pilot-discovery-0:2.0.7-3.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/latest/service_mesh/v2x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3272
  • Fixedservicemesh-0:1.1.17-3.el8.ppc64le 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-0:1.1.17-3.el8.s390x 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-0:1.1.17-3.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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-0:1.1.17-3.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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-citadel-0:1.1.17-3.el8.ppc64le 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-citadel-0:1.1.17-3.el8.s390x 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-citadel-0:1.1.17-3.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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-galley-0:1.1.17-3.el8.ppc64le 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-galley-0:1.1.17-3.el8.s390x 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-galley-0:1.1.17-3.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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-istioctl-0:1.1.17-3.el8.ppc64le 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-istioctl-0:1.1.17-3.el8.s390x 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-istioctl-0:1.1.17-3.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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-mixc-0:1.1.17-3.el8.ppc64le 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-mixc-0:1.1.17-3.el8.s390x 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-mixc-0:1.1.17-3.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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-mixs-0:1.1.17-3.el8.ppc64le 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-mixs-0:1.1.17-3.el8.s390x 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-mixs-0:1.1.17-3.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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-pilot-agent-0:1.1.17-3.el8.ppc64le 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-pilot-agent-0:1.1.17-3.el8.s390x 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-pilot-agent-0:1.1.17-3.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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-pilot-discovery-0:1.1.17-3.el8.ppc64le 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-pilot-discovery-0:1.1.17-3.el8.s390x 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-pilot-discovery-0:1.1.17-3.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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-sidecar-injector-0:1.1.17-3.el8.ppc64le 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-sidecar-injector-0:1.1.17-3.el8.s390x 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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
  • Fixedservicemesh-sidecar-injector-0:1.1.17-3.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/4.8/service_mesh/v1x/servicemesh-release-notes.html

    https://access.redhat.com/errata/RHSA-2021:3273
02

cvss

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

8.3
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–8.3

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6
v3.18.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Nsecondary · ENISA EU
v3.18.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Nsecondary · security-advisories@github.comexploitability 2.8 · impact 5.2
v3.18.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Nsecondary · OSV
v3.17.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Psecondary · CVSS-BT (t0sche)
v3.18.3highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:Lsecondary · Red Hat Product Security US
03

weaknesses

The CWE weakness classes this flaw belongs to.

04

exploits (1)

Public proof-of-concept and weaponised exploit code.

05

affected products (64)

Products and version ranges known to be affected.

showing 20 of 64
06

advisories (3)

Vendor and ecosystem advisories describing this.

  • RHSA-2021:3272Red Hat Security Advisory: Red Hat OpenShift Service Mesh 2.0.7.1 security update2021-08-25csaf · redhat_csafUS

    An update for servicemesh and servicemesh-proxy 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-2021:3273Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.1.17.1 security update2021-08-25csaf · redhat_csafUS

    An update for servicemesh and servicemesh-proxy 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.

  • GHSA-hqxw-mm44-gc4rIstio Fragments in Path May Lead to Authorization Policy Bypass2021-08-30ghsa · osvUS

    ### Impact Istio 1.11.0, 1.10.3 and below, and 1.9.7 and below contain a remotely exploitable vulnerability where an HTTP request with `#fragment` in the path may bypass Istio’s URI path based authorization policies. ### Patches * Istio 1.11.1 and above * Istio 1.10.4 and above * Istio 1.9.8 and above ### Workarounds A Lua filter may be written to normalize the path. This is similar to the Path normalization presented in the [Security Best Practices](https://istio.io/latest/docs/ops/best-practices/security/#case-normalization) guide. ### References More details can be found in the [Istio Security Bulletin](https://istio.io/latest/news/security/istio-security-2021-008) ### For more information If you have any questions or comments about this advisory, please email us at istio-security-vulnerability-reports@googlegroups.com

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

published 2021-08-24modified 2026-06-17
10

references (9)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan