VULNERABILITY INTELLIGENCE

CVE-2021-3636

CVSS score4.6 MEDIUM

EPSS probability0.28%

CISA KEVNot currently listed

Published2021-07-30

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Description

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.

Weakness classification

secalert@redhat.com: CWE-295
nvd@nist.gov: CWE-287

Primary references

secalert@redhat.com — Exploit, Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Issue Tracking, Patch, Third Party Advisory