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CVE-2021-21428

9.3 · CRITICAL

Openapi generator is a java tool which allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec.

Published May 10, 2021CWE-269EPSS 0.35%

Overview

CVE-2021-21428 is a critical-severity vulnerability. It was published on May 10, 2021 and has a CVSS 3.1 base score of 9.3 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

Openapi generator is a java tool which allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec. openapi-generator-online creates insecure temporary folders with File.createTempFile during the code generation process. The insecure temporary folders store the auto-generated files which can be read and appended to by any users on the system. The issue has been patched with `Files.createTempFile` and released in the v5.1.0 stable version.

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/OpenAPITools/openapi-generator/pull/8788GitHubgithub.com/OpenAPITools/openapi-generator/security/advisories/GHSA-23x4-m842-fmwfGitHubgithub.com/OpenAPITools/openapi-generator/pull/8788GitHubgithub.com/OpenAPITools/openapi-generator/security/advisories/GHSA-23x4-m842-fmwf

How CyberStrike helps

Frequently asked questions

What is CVE-2021-21428?

CVE-2021-21428 is a critical-severity vulnerability. It was published on May 10, 2021 and has a CVSS 3.1 base score of 9.3 (CRITICAL).

How severe is CVE-2021-21428?

This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-21428?

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-2021-21428?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-21428 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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