CVE-2021-21429

Name: CVE-2021-21429
Creator: NVD / NIST
Published: 2021-04-27T20:15:08.763+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.3/10EPSS 0.30%

Last modified Jun 17, 2026

CVE-2021-21429 is a low-severity vulnerability rated 3.3/10 on the CVSS scale. OpenAPI Generator allows generation of API client libraries, server stubs, documentation and configuration automatically given an OpenAPI Spec. Using `File.createTempFile` in JDK will result in creating and using insecure temporary files that can leave application and system data vulnerable to attacks. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

Description

OpenAPI Generator allows generation of API client libraries, server stubs, documentation and configuration automatically given an OpenAPI Spec. Using `File.createTempFile` in JDK will result in creating and using insecure temporary files that can leave application and system data vulnerable to attacks. OpenAPI Generator maven plug-in creates insecure temporary files during the process. The issue has been patched with `Files.createTempFile` and released in the v5.1.0 stable version.

Metrics

CVSS 3.1

3.3/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

0.30%

21.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-552

Affected Software

Vendor	Product	Versions
Openapi-Generator	Openapi Generator	< 5.1.0

References

https://github.com/OpenAPITools/openapi-generator/pull/8795Patch, Third Party Advisory
https://github.com/OpenAPITools/openapi-generator/security/advisories/GHSA-867q-77cc-98mvPatch, Third Party Advisory
https://github.com/OpenAPITools/openapi-generator/pull/8795Patch, Third Party Advisory
https://github.com/OpenAPITools/openapi-generator/security/advisories/GHSA-867q-77cc-98mvPatch, Third Party Advisory

Timeline

Published: Apr 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21429?

How severe is CVE-2021-21429?

CVE-2021-21429 has a CVSS score of 3.3/10 (LOW severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21429?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21429?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST