CVE-2021-3636

mediumpriority · track · 18EPSS 0.003 · 21 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.28% (21st) EPSS

CVSS 4.1 · medium

Is it mine?

4 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

It was found in OpenShift, before version 4.8, that the generated certificate for the in-cluster Service CA, incorrectly included additional certificates. The Service CA is automatically mounted into all pods, allowing them to safely connect to trusted in-cluster services that present certificates signed by the trusted Service CA. The incorrect inclusion of additional CAs in this certificate would allow an attacker that compromises any of the additional CAs to masquerade as a trusted in-cluster service.

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 · 4.1–7.5

v2.04.1mediumAV:A/AC:L/Au:S/C:P/I:P/A:Nprimary · NVD / NIST USexploitability 5.1 · impact 4.9

v3.14.6mediumCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.1 · impact 2.5

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondary · FSTEC (BDU) RU

v3.14.2mediumCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287USprimaryCWE-287USCWE-295USCWE-295US

affected products (4)

Products and version ranges known to be affected.

n/a OpenShift≤ openshift 4.8enisa_euvdEU
Red Hat Inc. OpenShift≤ 3.11fstec_bduRU
Red Hat Inc. OpenShift≤ 4.8fstec_bduRU
redhat openshift< 4.8nvdUScpe:2.3:a:redhat:openshift:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2021-07-30modified 2026-06-17

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+7710 more

references (11)

External citations — patches, advisories, analysis.

scry

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