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CVE-2019-11253

7.5 · HIGH

Improper input validation in the Kubernetes API server in versions v1.0-1.12 and versions prior to v1.13.12, v1.14.8, v1.15.5, and v1.16.2 allows authorized users to send malicious YAML or JSON pay…

Published Oct 17, 2019CWE-20EPSS 25.94%

Overview

CVE-2019-11253 is a high-severity vulnerability. It was published on October 17, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Improper input validation in the Kubernetes API server in versions v1.0-1.12 and versions prior to v1.13.12, v1.14.8, v1.15.5, and v1.16.2 allows authorized users to send malicious YAML or JSON payloads, causing the API server to consume excessive CPU or memory, potentially crashing and becoming unavailable. Prior to v1.14.0, default RBAC policy authorized anonymous users to submit requests that could trigger this vulnerability. Clusters upgraded from a version prior to v1.14.0 keep the more permissive policy by default for backwards compatibility.

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

Refaccess.redhat.com/errata/RHSA-2019:3239Refaccess.redhat.com/errata/RHSA-2019:3811Refaccess.redhat.com/errata/RHSA-2019:3905GitHubgithub.com/kubernetes/kubernetes/issues/83253Refgroups.google.com/forum/#%21topic/kubernetes-security-announce/jk8polzSUxsRefsecurity.netapp.com/advisory/ntap-20191031-0006/Refaccess.redhat.com/errata/RHSA-2019:3239Refaccess.redhat.com/errata/RHSA-2019:3811Refaccess.redhat.com/errata/RHSA-2019:3905GitHubgithub.com/kubernetes/kubernetes/issues/83253

How CyberStrike helps

Frequently asked questions

What is CVE-2019-11253?

CVE-2019-11253 is a high-severity vulnerability. It was published on October 17, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2019-11253?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-11253?

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-2019-11253?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-11253 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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