Is CVE-2021-21363 actively exploited?

No active exploitation of CVE-2021-21363 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-21363 be exploited remotely?

No. CVE-2021-21363 requires local access to exploit.

What is the CVSS score of CVE-2021-21363?

CVE-2021-21363 has a CVSS score of 7.0 (HIGH).

HOME VULNERABILITIESCVE-2021-21363

HIGH

CVE-2021-21363

CWE-378Published: March 11, 2021· Updated: Jun 17, 2026

7.0

CVSS v3.1

Official Description

swagger-codegen is an open-source project which contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition. In swagger-codegen before version 2.4.19, on Unix like systems, the system's temporary directory is shared between all users on that system. A collocated user can observe the process of creating a temporary sub directory in the shared temporary directory and race to complete the creation of the temporary subdirectory. This vulnerability is local privilege escalation because the contents of the `outputFolder` can be appended to by an attacker. As such, code written to this directory, when executed can be attacker controlled. For more details refer to the referenced GitHub Security Advisory. This vulnerability is fixed in version 2.4.19. Note this is a distinct vulnerability from CVE-2021-21364.

NVD Source

Technical Analysis

CVE-2021-21363 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.0.