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No exploitation reportedFix available

CVE-2021-28682

No exploitation reported by the sources we read.

  • Published2021-05-20
  • WeaknessCWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discovered in Envoy through 1.71.1. There is a remotely exploitable integer overflow in which a very large grpc-timeout value leads to unexpected timeout calculations.

Timeline

dates in UTC
  1. 2021-05-2017:15CVE publishedNVD

Versions per branch

NVD · OSV
Envoy
BranchAffectedFixed in
1.14= 1.14.6no fix published
1.15= 1.15.3no fix published
1.16= 1.16.2no fix published
1.17= 1.17.1no fix published
envoy
BranchAffectedFixed in
1.17≥ 1.17.1, < 1.17.21.17.2
1.16≥ 1.16.2, < 1.16.31.16.3
1.15≥ 1.15.3, < 1.15.41.15.4
1.14≥ 1.14.6, < 1.14.71.14.7

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • servicemesh-pilot-agentRed Hat:service_mesh:1.1::el8all versions · fixed in 0:1.1.13-3.el8and 1 other package
  • servicemesh-proxyRed Hat:service_mesh:2.0::el8all versions · fixed in 0:2.0.3-1.el8
  • servicemesh-proxyRed Hat:service_mesh:1.1::el8all versions · fixed in 0:1.1.13-1.el8

Vendor advisories

  • CVE-2021-28682 Red Hat Product Security8 products fixed

    envoyproxy/envoy: integer overflow handling large grpc-timeouts

  • RHSA-2021:1322 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.1.13 security update

  • RHSA-2021:1324 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat OpenShift Service Mesh 2.0.3 security update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2021:1322 · 4 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2021-05-20
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-r22g-5f3x-xjgg

Frequently asked questions

What is CVE-2021-28682?

An issue was discovered in Envoy through 1.71.1. There is a remotely exploitable integer overflow in which a very large grpc-timeout value leads to unexpected timeout calculations.

Is CVE-2021-28682 actively exploited?

Active exploitation of CVE-2021-28682 has not been confirmed. Its EPSS score was 2.0% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-28682?

CVE-2021-28682 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record