CVE-2021-29258

mediumpriority · track · 31EPSS 0.018 · 78 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.77% (78th) EPSS

CVSS 5 · medium

Is it mine?

41 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

An issue was discovered in Envoy 1.14.0. There is a remotely exploitable crash for HTTP2 Metadata, because an empty METADATA map triggers a Reachable Assertion.

remediations

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

A vendor fix is available.

Fixedservicemesh-proxy-0:1.1.13-1.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-2021:1322
Fixedservicemesh-proxy-0:1.1.13-1.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-2021:1322
Fixedservicemesh-proxy-0:1.1.13-1.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-2021:1322
Fixedservicemesh-proxy-0:1.1.13-1.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-2021:1322
Fixedservicemesh-proxy-0:2.0.3-1.el8.ppc64le as a component of OpenShift Service Mesh 2.0redhat_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-2021:1324
Fixedservicemesh-proxy-0:2.0.3-1.el8.s390x as a component of OpenShift Service Mesh 2.0redhat_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-2021:1324
Fixedservicemesh-proxy-0:2.0.3-1.el8.src as a component of OpenShift Service Mesh 2.0redhat_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-2021:1324
Fixedservicemesh-proxy-0:2.0.3-1.el8.x86_64 as a component of OpenShift Service Mesh 2.0redhat_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-2021:1324

cvss

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

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

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

v3.16.9mediumCVSS: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

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-617USprimaryCWE-476US

affected products (41)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
envoyproxy envoy= 1.14.6nvdUScpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
envoyproxy envoy= 1.15.3nvdUScpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
envoyproxy envoy= 1.16.2nvdUScpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
envoyproxy envoy= 1.17.1nvdUScpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
Bitnami envoy1.14.6 → 1.14.7osvUSpkg:bitnami/envoy
Bitnami envoy1.15.3 → 1.15.4osvUSpkg:bitnami/envoy
Bitnami envoy1.16.2 → 1.16.3osvUSpkg:bitnami/envoy
Bitnami envoy1.17.1 → 1.17.2osvUSpkg:bitnami/envoy
servicemesh-0:1.1.13-3.el8.ppc64le as a component of OpenShift Service Mesh 1.1all versionsnot affectedredhat_csafUS
servicemesh-0:1.1.13-3.el8.s390x as a component of OpenShift Service Mesh 1.1all versionsnot affectedredhat_csafUS
servicemesh-0:1.1.13-3.el8.src as a component of OpenShift Service Mesh 1.1all versionsnot affectedredhat_csafUS
servicemesh-0:1.1.13-3.el8.x86_64 as a component of OpenShift Service Mesh 1.1all versionsnot affectedredhat_csafUS
servicemesh-citadel-0:1.1.13-3.el8.ppc64le as a component of OpenShift Service Mesh 1.1all versionsnot affectedredhat_csafUS
servicemesh-citadel-0:1.1.13-3.el8.s390x as a component of OpenShift Service Mesh 1.1all versionsnot affectedredhat_csafUS
servicemesh-citadel-0:1.1.13-3.el8.x86_64 as a component of OpenShift Service Mesh 1.1all versionsnot affectedredhat_csafUS
servicemesh-galley-0:1.1.13-3.el8.ppc64le as a component of OpenShift Service Mesh 1.1all versionsnot affectedredhat_csafUS
servicemesh-galley-0:1.1.13-3.el8.s390x as a component of OpenShift Service Mesh 1.1all versionsnot affectedredhat_csafUS
servicemesh-galley-0:1.1.13-3.el8.x86_64 as a component of OpenShift Service Mesh 1.1all versionsnot affectedredhat_csafUS
servicemesh-istioctl-0:1.1.13-3.el8.ppc64le as a component of OpenShift Service Mesh 1.1all versionsnot affectedredhat_csafUS

showing 20 of 41

advisories (3)

Vendor and ecosystem advisories describing this.

RHSA-2021:1322Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.1.13 security update2021-04-22csaf · 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.
RHSA-2021:1324Red Hat Security Advisory: Red Hat OpenShift Service Mesh 2.0.3 security update2021-04-22csaf · redhat_csafUS
An update for 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.
BIT-envoy-2021-292582024-03-06vendor · osvUS
An issue was discovered in Envoy 1.14.0. There is a remotely exploitable crash for HTTP2 Metadata, because an empty METADATA map triggers a Reachable Assertion.

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv redhat_csaf NVD CVE.org MITRE

published 2021-05-20modified 2026-06-17

related (1,031)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2015-5477US	high7.8OT critical	99.6% (100th)	KEV	2015-07-29
named in ISC BIND 9.x before 9.9.7-P2 and 9.10.x before 9.10.2-P3 allows remote attackers to cause a denial of service (REQUIRE assertion failure and daemon exit) via TKEY queries.
CVE-2016-2776US	high7.5	89.5% (100th)	Exploit	2016-09-28
buffer.c in named in ISC BIND 9 before 9.9.9-P3, 9.10.x before 9.10.4-P3, and 9.11.x before 9.11.0rc3 does not properly construct responses, which allows remote attackers to cause…
CVE-2021-25216US	critical9.8	83.0% (100th)	—	2021-04-29
In BIND 9.5.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.11.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.…
CVE-2020-8617US	medium5.9	93.4% (100th)	Exploit	2020-05-19
Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG…
CVE-2018-5740US	high7.5	59.6% (99th)	Exploit	2019-01-16
"deny-answer-aliases" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the…

+1026 more

references (18)

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