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CVE-2021-25735

6.5 · MEDIUM

A security issue was discovered in kube-apiserver that could allow node updates to bypass a Validating Admission Webhook.

Published Sep 6, 2021CWE-372EPSS 5.38%

Overview

CVE-2021-25735 is a medium-severity vulnerability. It was published on September 6, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, 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 kube-apiserver that could allow node updates to bypass a Validating Admission Webhook. Clusters are only affected by this vulnerability if they run a Validating Admission Webhook for Nodes that denies admission based at least partially on the old state of the Node object. Validating Admission Webhook does not observe some previous fields.

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/100096Refgroups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9YGitHubgithub.com/kubernetes/kubernetes/issues/100096Refgroups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9Y

How CyberStrike helps

Frequently asked questions

What is CVE-2021-25735?

CVE-2021-25735 is a medium-severity vulnerability. It was published on September 6, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2021-25735?

This vulnerability has a CVSS 3.1 base score of 6.5, 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-2021-25735?

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-2021-25735?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-25735 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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