CVE-2021-21428
9.3 · CRITICALOverview
CVE-2021-21428 is a critical-severity vulnerability affecting openapi-generator openapi_generator. 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 and patches from openapi-generator. Update openapi_generator to the latest patched version. 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.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| openapi-generator | openapi_generator | >= 0, < 5.1.0 | Affected |
References
Frequently Asked Questions
What is CVE-2021-21428?
CVE-2021-21428 is a critical-severity vulnerability affecting openapi-generator openapi_generator. 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 and patches from openapi-generator. Update openapi_generator to the latest patched version. 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's AI-powered security agents can automatically detect CVE-2021-21428 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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