CVE-2020-27831

mediumpriority · track · 17EPSS 0.005 · 46 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.55% (46th) EPSS

CVSS 4 · medium

Is it mine?

8 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · redhat_csaf

EPSS · scored 2026-10-27

A flaw was found in Red Hat Quay, where it does not properly protect the authorization token when authorizing email addresses for repository email notifications. This flaw allows an attacker to add email addresses they do not own to repository notifications.

remediations

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

A vendor fix is available.

Fixedquay/quay-container-security-rhel8-operator-metadata@sha256:4befaafcec10f6d60d2b3a59479d7b3f88cfce1c80e90a32e54caa0fc86e9b5a_amd64 as a component of Quay v3redhat_csaf
Download the release images via: quay.io/redhat/quay:v3.3.3 quay.io/redhat/clair-jwt:v3.3.3 quay.io/redhat/quay-builder:v3.3.3 quay.io/redhat/clair:v3.3.3
https://access.redhat.com/errata/RHSA-2021:0050
Fixedquay/quay-container-security-rhel8-operator@sha256:d775b67203182f3197aa2322ddb36dff835f54e354d19581a4131325aa2143f6_amd64 as a component of Quay v3redhat_csaf
Download the release images via: quay.io/redhat/quay:v3.3.3 quay.io/redhat/clair-jwt:v3.3.3 quay.io/redhat/quay-builder:v3.3.3 quay.io/redhat/clair:v3.3.3
https://access.redhat.com/errata/RHSA-2021:0050
Fixedquay/quay-openshift-bridge-rhel8-operator-metadata@sha256:95dcb9bc5c5500e0d99faf8b8bfab474f49730d6411ab07c5021ddc18f8116f5_amd64 as a component of Quay v3redhat_csaf
Download the release images via: quay.io/redhat/quay:v3.3.3 quay.io/redhat/clair-jwt:v3.3.3 quay.io/redhat/quay-builder:v3.3.3 quay.io/redhat/clair:v3.3.3
https://access.redhat.com/errata/RHSA-2021:0050
Fixedquay/quay-openshift-bridge-rhel8-operator@sha256:4c5bae8fa66392cb05efde2c5f2ce3364a79c31e3176a5465fe3d33af89b39e4_amd64 as a component of Quay v3redhat_csaf
Download the release images via: quay.io/redhat/quay:v3.3.3 quay.io/redhat/clair-jwt:v3.3.3 quay.io/redhat/quay-builder:v3.3.3 quay.io/redhat/clair:v3.3.3
https://access.redhat.com/errata/RHSA-2021:0050
Fixedquay/quay-operator-bundle@sha256:b497ea18ad6989fff889124a10ca02de4d435d6ec3cdff3f954be18203cae204_amd64 as a component of Quay v3redhat_csaf
Download the release images via: quay.io/redhat/quay:v3.3.3 quay.io/redhat/clair-jwt:v3.3.3 quay.io/redhat/quay-builder:v3.3.3 quay.io/redhat/clair:v3.3.3
https://access.redhat.com/errata/RHSA-2021:0050
Fixedquay/quay-rhel8-operator@sha256:84f200f48320ff0b30afac45c935086d42155a31d9e6c9a219ea4d7de98ab7b4_amd64 as a component of Quay v3redhat_csaf
Download the release images via: quay.io/redhat/quay:v3.3.3 quay.io/redhat/clair-jwt:v3.3.3 quay.io/redhat/quay-builder:v3.3.3 quay.io/redhat/clair:v3.3.3
https://access.redhat.com/errata/RHSA-2021:0050
Workaroundquay/quay-container-security-rhel8-operator-metadata@sha256:4befaafcec10f6d60d2b3a59479d7b3f88cfce1c80e90a32e54caa0fc86e9b5a_amd64 as a component of Quay v3redhat_csaf
Disable email using the configuration app.
Workaroundquay/quay-container-security-rhel8-operator@sha256:d775b67203182f3197aa2322ddb36dff835f54e354d19581a4131325aa2143f6_amd64 as a component of Quay v3redhat_csaf
Disable email using the configuration app.
Workaroundquay/quay-openshift-bridge-rhel8-operator-metadata@sha256:95dcb9bc5c5500e0d99faf8b8bfab474f49730d6411ab07c5021ddc18f8116f5_amd64 as a component of Quay v3redhat_csaf
Disable email using the configuration app.
Workaroundquay/quay-openshift-bridge-rhel8-operator@sha256:4c5bae8fa66392cb05efde2c5f2ce3364a79c31e3176a5465fe3d33af89b39e4_amd64 as a component of Quay v3redhat_csaf
Disable email using the configuration app.
Workaroundquay/quay-operator-bundle@sha256:b497ea18ad6989fff889124a10ca02de4d435d6ec3cdff3f954be18203cae204_amd64 as a component of Quay v3redhat_csaf
Disable email using the configuration app.
Workaroundquay/quay-rhel8-operator@sha256:84f200f48320ff0b30afac45c935086d42155a31d9e6c9a219ea4d7de98ab7b4_amd64 as a component of Quay v3redhat_csaf
Disable email using the configuration app.

cvss

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

4.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.6–4.3

v2.04mediumAV:N/AC:L/Au:S/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8 · impact 2.9

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 1.4

v3.14mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.12.6lowCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:Lsecondary · Red Hat Product Security US

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-522USprimaryCWE-284USCWE-284US

affected products (8)

Products and version ranges known to be affected.

n/a quay≤ Quay 3.3.3enisa_euvdEU
redhat quay3.0.0 → 3.3.3nvdUScpe:2.3:a:redhat:quay:*:*:*:*:*:*:*:*
quay/quay-container-security-rhel8-operator-metadata@sha256:4befaafcec10f6d60d2b3a59479d7b3f88cfce1c80e90a32e54caa0fc86e9b5a_amd64 as a component of Quay v3all versionsfixedredhat_csafUS
quay/quay-container-security-rhel8-operator@sha256:d775b67203182f3197aa2322ddb36dff835f54e354d19581a4131325aa2143f6_amd64 as a component of Quay v3all versionsfixedredhat_csafUS
quay/quay-openshift-bridge-rhel8-operator-metadata@sha256:95dcb9bc5c5500e0d99faf8b8bfab474f49730d6411ab07c5021ddc18f8116f5_amd64 as a component of Quay v3all versionsfixedredhat_csafUS
quay/quay-openshift-bridge-rhel8-operator@sha256:4c5bae8fa66392cb05efde2c5f2ce3364a79c31e3176a5465fe3d33af89b39e4_amd64 as a component of Quay v3all versionsfixedredhat_csafUS
quay/quay-operator-bundle@sha256:b497ea18ad6989fff889124a10ca02de4d435d6ec3cdff3f954be18203cae204_amd64 as a component of Quay v3all versionsfixedredhat_csafUS
quay/quay-rhel8-operator@sha256:84f200f48320ff0b30afac45c935086d42155a31d9e6c9a219ea4d7de98ab7b4_amd64 as a component of Quay v3all versionsfixedredhat_csafUS

advisories (1)

Vendor and ecosystem advisories describing this.

RHSA-2021:0050Red Hat Security Advisory: Red Hat Quay v3.3.3 bug fix and security update2021-01-11csaf · redhat_csafUS
Red Hat Quay v3.3.3 is now available with bug fixes and security updates. 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. Note: Red Hat Quay v3.3.2 was not released publicly.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd redhat_csaf NVD CVE.org MITRE

published 2021-05-27modified 2026-06-17

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references (6)

External citations — patches, advisories, analysis.

scry

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