CVE-2021-21429

lowpriority · track · 13EPSS 0.003 · 22 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.30% (22nd) EPSS

CVSS 2.1 · low

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

4.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.1–4

v2.02.1lowAV:L/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 2.9

v3.13.3lowCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 1.8 · impact 1.4

v3.14mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.14mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · security-advisories@github.comexploitability 2.5 · impact 1.4

v3.14mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · OSV

v3.13.1lowCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-377USCWE-378USCWE-379USCWE-552USCWE-552US

affected products (3)

Products and version ranges known to be affected.

OpenAPITools openapi-generator≤ < 5.1.0enisa_euvdEU
openapi-generator openapi generator< 5.1.0nvdUScpe:2.3:a:openapi-generator:openapi_generator:*:*:*:*:*:*:*:*
Maven org.openapitools:openapi-generator-maven-plugin< 5.1.0osvUSpkg:maven/org.openapitools/openapi-generator-maven-plugin

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-867q-77cc-98mvCreation of Temporary File in Directory with Insecure Permissions in the OpenAPI Generator Maven plugin2021-04-29ghsa · osvUS
### Impact Using `File.createTempFile` in JDK will result in creating and using insecure temporary files that can leave application and system data vulnerable to attacks. This vulnerability only impacts unix-like systems where the local system temporary directory is shared between all users. This vulnerability does not impact Windows or modern versions of MacOS. OpenAPI Generator Maven plug-in creates insecure temporary files during the code generation process. It creates insecure temporary files to store the OpenAPI specification files provided by the users and these temporary files can be read by any users in the system. The impact of this vulnerability is information disclosure of the contents of the specification file to other local users. ### Patches The issue has been patched with `Files.createTempFile` and released in the v5.1.0 stable version. ### For more information If you have any questions or comments about this advisory: * Open an issue in [OpenAPI Generator Github repo](https://github.com/openAPITools/openapi-generator/) * Email us at [security@openapitools.org](mailto:security@openapitools.org)

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2021-04-27modified 2026-06-17

references (7)

External citations — patches, advisories, analysis.

scry

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