CVE-2021-20198

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-02-23 · updated 2026-06-17
Weakness: CWE-306

Description

A flaw was found in the OpenShift Installer before version v0.9.0-master.0.20210125200451-95101da940b0. During installation of OpenShift Container Platform 4 clusters, bootstrap nodes are provisioned with anonymous authentication enabled on kubelet port 10250. A remote attacker able to reach this port during installation can make unauthenticated `/exec` requests to execute arbitrary commands within running containers. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Affected products

openshift/installer: before 0.9.0-master.0.20210125200451-95101da940b0 — fixed in 0.9.0-master.0.20210125200451-95101da940b0

How to fix

Upgrade to a fixed version: openshift/installer 0.9.0-master.0.20210125200451-95101da940b0. Check the vendor advisory for mitigations.

References

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