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CVE-2021-21429— Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI Generator Maven plugin

Quick assessment

Affected
OpenAPITools openapi-generator
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenAPI Tools OpenAPI Generator是一款OpenAPI生成器。该产品允许在给定OpenAPI规范（v2，v3）的情况下自动生成API客户端库（SDK生成），服务器存根，文档和配置等。 OpenAPI Generator v5.1.0 存在安全漏洞，该漏洞源于OpenAPI Generator maven插件会创建不安全的临时文件。

CVSS 4.0 · Medium EPSS 0.30% · P21
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I. Basic Information for CVE-2021-21429

Vulnerability Information
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Vulnerability Title
Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI Generator Maven plugin
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对外部实体的文件或目录可访问
Source: CVE Program / CVE List V5
Vulnerability Title
OpenAPI Generator 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenAPI Tools OpenAPI Generator是一款OpenAPI生成器。该产品允许在给定OpenAPI规范（v2，v3）的情况下自动生成API客户端库（SDK生成），服务器存根，文档和配置等。 OpenAPI Generator v5.1.0 存在安全漏洞，该漏洞源于OpenAPI Generator maven插件会创建不安全的临时文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenAPITools openapi-generator < 5.1.0 -

II. Public POCs for CVE-2021-21429

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III. Intelligence Information for CVE-2021-21429

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Patches & Fixes for CVE-2021-21429 (1)

Vendor Advisories for CVE-2021-21429 (1)

IV. Related Vulnerabilities

Same product: openapi-generator
Same vendor: OpenAPITools
Same weakness: CWE-552

V. Comments for CVE-2021-21429

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