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CVE-2020-8561

4.1 · MEDIUM

A security issue was discovered in Kubernetes where actors that control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver…

Published Sep 20, 2021CWE-441EPSS 2.10%

Overview

CVE-2020-8561 is a medium-severity vulnerability. It was published on September 20, 2021 and has a CVSS 3.1 base score of 4.1 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.1, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

A security issue was discovered in Kubernetes where actors that control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the apiserver. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/kubernetes/kubernetes/issues/104720Refgroups.google.com/g/kubernetes-security-announce/c/RV2IhwcrQsYRefkubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/Refsecurity.netapp.com/advisory/ntap-20211014-0002/GitHubgithub.com/kubernetes/kubernetes/issues/104720Refgroups.google.com/g/kubernetes-security-announce/c/RV2IhwcrQsYRefsecurity.netapp.com/advisory/ntap-20211014-0002/

How CyberStrike helps

Frequently asked questions

What is CVE-2020-8561?

CVE-2020-8561 is a medium-severity vulnerability. It was published on September 20, 2021 and has a CVSS 3.1 base score of 4.1 (MEDIUM).

How severe is CVE-2020-8561?

This vulnerability has a CVSS 3.1 base score of 4.1, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2020-8561?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-8561?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-8561 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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