CVE-2021-20218

Name: CVE-2021-20218
Creator: NVD / NIST
Published: 2021-03-16T21:15:10.93+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.4/10EPSS 1.31%

Last modified Jun 17, 2026

CVE-2021-20218 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. A flaw was found in the fabric8 kubernetes-client in version 4.2.0 and after. This flaw allows a malicious pod/container to cause applications using the fabric8 kubernetes-client `copy` command to extract files outside the working path. EPSS estimates a 1.31% chance of exploitation in the next 30 days.

Description

A flaw was found in the fabric8 kubernetes-client in version 4.2.0 and after. This flaw allows a malicious pod/container to cause applications using the fabric8 kubernetes-client `copy` command to extract files outside the working path. The highest threat from this vulnerability is to integrity and system availability. This has been fixed in kubernetes-client-4.13.2 kubernetes-client-5.0.2 kubernetes-client-4.11.2 kubernetes-client-4.7.2

Metrics

CVSS 3.1

7.4/10

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

EPSS Probability

1.31%

67.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Redhat	Kubernetes-Client	>= 4.2.0, < 4.7.2
Redhat	Kubernetes-Client	>= 4.8.0, < 4.11.2
Redhat	Kubernetes-Client	>= 4.12.0, < 4.13.2
Redhat	Kubernetes-Client	>= 5.0.0, < 5.0.2
Redhat	A-Mq Online	All versions
Redhat	Build Of Quarkus	All versions
Redhat	Codeready Studio	12.0
Redhat	Descision Manager	7.0
Redhat	Integration Camel K	All versions
Redhat	Jboss Fuse	7.0.0
Redhat	Openshift Container Platform	3.11
Redhat	Process Automation	7.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=1923405Issue Tracking, Vendor Advisory
https://github.com/fabric8io/kubernetes-client/issues/2715Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1923405Issue Tracking, Vendor Advisory
https://github.com/fabric8io/kubernetes-client/issues/2715Patch, Third Party Advisory

Timeline

Published: Mar 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20218?

How severe is CVE-2021-20218?

CVE-2021-20218 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 1.31% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20218?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20218?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST