CVE-2021-21429
Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI Generator Maven plugin
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI Generator Maven plugin
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.
- Record
CVE-2021-21429- CVSS 3.1
- 4.0 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-552
- Updated
- 2026-11-02
EUVDEUVD-2021-0794
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.
- Record
EUVD-2021-0794- CVSS 3.1
- 4.0 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-867q-77cc-98mv
Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI Generator Maven plugin
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
- Email us at [email protected]
- Record
GHSA-867q-77cc-98mv- CVSS 3.1
- 4.0 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-377, CWE-378, CWE-379, CWE-552
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-21429- CVSS 3.1
- 4.0 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - CVSS 2.0
- 2.1 Low
AV:L/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-552
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2021-21429- CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - Updated
- 2026-11-02
OSVGHSA-867q-77cc-98mv
Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI Generator Maven plugin
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
- Email us at [email protected]
- Record
GHSA-867q-77cc-98mv- CVSS 3.1
- 4.0 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-377, CWE-378, CWE-379, CWE-552
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.openapitools:openapi-generator-maven-pluginMaven |
before 5.1.0 | 5.1.0 |
org.openapitools:openapi-generator-maven-pluginMaven |
before 5.1.0, plus listed versions 3.0.03.0.13.0.23.0.33.1.0 Show 33 moreShow less3.1.13.1.23.2.03.2.13.2.23.2.33.3.03.3.13.3.23.3.33.3.44.0.04.0.0-beta4.0.0-beta24.0.0-beta34.0.14.0.24.0.34.1.04.1.14.1.24.1.34.2.04.2.14.2.24.2.34.3.04.3.15.0.05.0.0-beta5.0.0-beta25.0.0-beta35.0.1 |
5.1.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-21429 is a medium vulnerability (CVSS 4.0) in Openapi-generator Openapi Generator, published April 27, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.30%, the 22nd percentile. Fixed in org.openapitools:openapi-generator-maven-plugin 5.1.0.
References
github.com/OpenAPITools/openapi-generator/security/advisories/GHSA-867q-77cc-98mv
nvd.nist.gov/vuln/detail/CVE-2021-21429