TI-2021-04527 Aliases CVE-2021-21429 GHSA-867q-77cc-98mv

Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI Generator Maven plugin

LOW 19CWE-552Published 2021-04-27 · Updated 2024-08-03

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: Low · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-552.

Summary

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.

Why it matters now

EPSS 0.00296 22nd percentileScored 2026-11-07

Fix Fixed openapi-generator (OpenAPITools): 5.1.0org.openapitools:openapi-generator-maven-plugin (Maven): 5.1.0

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
OpenAPITools	openapi-generator	before 5.1.0	5.1.0	Patch available	CNA
—	org.openapitools:openapi-generator-maven-plugin (Maven)	before 5.1.0	5.1.0	Patch available	GHSA-867q-77cc-98mv

openapi-generator VendorOpenAPITools Affected before 5.1.0 Fixed in 5.1.0 Patch available CNA
org.openapitools:openapi-generator-maven-plugin (Maven) Vendor— Affected before 5.1.0 Fixed in 5.1.0 Patch available GHSA-867q-77cc-98mv

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:openapi-generator:openapi_generator::::::::	before 5.1.0	Vulnerable	OpenAPITools

cpe:2.3:a:openapi-generator:openapi_generator:*:*:*:*:*:*:*:* Versions before 5.1.0 Vulnerable ·OpenAPITools

Remediation

Fix · CNA openapi-generator (OpenAPITools) Fixed in 5.1.0
Fix · GHSA-867q-77cc-98mv org.openapitools:openapi-generator-maven-plugin (Maven) Fixed in 5.1.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 1 product

Red Hat Advanced Cluster Management for Kubernetes 2

Timeline

2026-10-02 Threatist record created from CVE-2021-21429
2026-10-03 Alias added: GHSA-867q-77cc-98mv

References

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2021-21429

Other 1

https://github.com/OpenAPITools/openapi-generator/blob/06ad7a51eff04393203cfa715e54e1fb59d984fe/modules/openapi-generator-maven-plugin/src/main/java/org/openapitools/codegen/plugin/CodeGenMojo.java#L782-L799

TI-2023-11951 openapi-generator up to v6.4.0 was discovered to contain a Server-Side Request Forgery… CVSS 3.1CRITICAL 9.1
TI-2021-04526 Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI-Generator online generator CVSS 3.1CRITICAL 9.3
TI-2019-08521 OpenAPI Tools OpenAPI Generator before 4.0.0-20190419.052012-560 uses http:// URLs in… CVSS 3.0HIGH 8.1
TI-2021-04528 Creation of Temporary File in Directory with Insecure Permissions in auto-generated Java, Scala code CVSS 3.1MEDIUM 6.2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences