Is CVE-2021-20198 in the CISA KEV catalog?

No. CVE-2021-20198 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20198?

CVE-2021-20198 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2021-20198?

CVE-2021-20198 has an EPSS score of 1.83% (76th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20198?

Upgrade openshift installer to 0.9.0-master.0.20210125200451-95101da940b0 or later.

CVE & CISA-KEV Catalog

CVE-2021-20198

HIGHEPSS 76th pctl

8.1

CVSS v3

NVD

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.

CWE-306Missing Authentication for Critical Function

How to fix

Remediation Available

openshift installerNVD

Affected:< 0.9.0-master.0.20210125200451-95101da940b0Fixed in:0.9.0-master.0.20210125200451-95101da940b0CVE-2021-20198derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.83%probability of exploitation in 30 days

76thpercentile

Elevated risk: more likely to be exploited than 76% of all known CVEs.

References

Patch1

bugzilla.redhat.com

Related Vulnerabilities

Other CWE-306 (Missing Authentication for Critical Function) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-10271	High	7.5	100%	KEV + Ransom	-
CVE-2023-42793	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2025-3248	Critical	9.8	100%	KEV	Fix
CVE-2022-1388	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2021-37415	Critical	9.8	100%	KEV	-
CVE-2023-21839	High	7.5	100%	KEV	-

Embed a live status badge for CVE-2021-20198

Markdown

[![CVE-2021-20198](https://tridentstack.com/cve/badge/CVE-2021-20198.svg)](https://tridentstack.com/cve/CVE-2021-20198)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-20198"><img src="https://tridentstack.com/cve/badge/CVE-2021-20198.svg" alt="CVE-2021-20198"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.