CVE-2021-32781

mediumpriority · track · 30EPSS 0.013 · 71 %ileEUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
1.33% (71st) EPSS
CVSS 5 · medium
Is it mine?
67 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions after Envoy sends a locally generated response it must stop further processing of request or response data. However when local response is generated due the internal buffer overflow while request or response is processed by the filter chain the operation may not be stopped completely and result in accessing a freed memory block. A specifically constructed request delivered by an untrusted downstream or upstream peer in the presence of extensions that modify and increase the size of request or response bodies resulting in a Denial of Service when using extensions that modify and increase the size of request or response bodies, such as decompressor filter. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to address incomplete termination of request processing after locally generated response. As a workaround disable Envoy's decompressor, json-transcoder or grpc-web extensions or proprietary extensions that modify and increase the size of request or response bodies, if feasible.

01

remediations

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

A vendor fix is available.

  • Fixedservicemesh-proxy-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-proxy-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-proxy-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-proxy-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-proxy-0:1.1.17-2.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-proxy-0:1.1.17-2.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-proxy-0:1.1.17-2.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-proxy-0:1.1.17-2.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.

8.6
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–8.6

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6
v3.18.6highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · ENISA EU
v3.18.6highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · security-advisories@github.comexploitability 3.9 · impact 4
v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · Red Hat Product Security US
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-120USprimaryCWE-416USCWE-476US
04

affected products (67)

Products and version ranges known to be affected.

showing 20 of 67
05

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.

  • BIT-envoy-2021-32781Continued processing of requests after locally generated response2024-03-06vendor · osvUS

    Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions after Envoy sends a locally generated response it must stop further processing of request or response data. However when local response is generated due the internal buffer overflow while request or response is processed by the filter chain the operation may not be stopped completely and result in accessing a freed memory block. A specifically constructed request delivered by an untrusted downstream or upstream peer in the presence of extensions that modify and increase the size of request or response bodies resulting in a Denial of Service when using extensions that modify and increase the size of request or response bodies, such as decompressor filter. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to address incomplete termination of request processing after locally generated response. As a workaround disable Envoy's decompressor, json-transcoder or grpc-web extensions or proprietary extensions that modify and increase the size of request or response bodies, if feasible.

06

also known as (3)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdosvnvdredhat_csafNVDCVE.orgMITRE
published 2021-08-24modified 2026-06-17
09

references (9)

External citations — patches, advisories, analysis.

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