CVE-2021-21364: swagger-codegen is an open-source project which contains a template-driven engine to generate documentation, A

Q: How do I fix CVE-2021-21364?

swagger-codegen: upgrade to 2.4.19. Exact commands for each OS are on this page.

Q: Is CVE-2021-21364 being exploited?

CVE-2021-21364 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-21364 affect?

CVE-2021-21364 affects swagger-codegen. Severity is medium (CVSS 5.3). 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

Q: How urgent is CVE-2021-21364?

Priority 24/100. No elevated risk signals yet.

Routine

MEDIUM 5.3UPGRADE

CVE-2021-21364 is a medium-severity flaw (CVSS 5.3) affecting swagger-codegen. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 temporary directory is shared between all local users. When files/directories are created, the default `umask` settings for the process are respected. As a result, by d

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-200, CWE-378, CWE-732
Published	2021-03-11
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: smartbear

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-03-11 03:15 UTCPublished CVE record published
2026-06-17 03:35 UTCUpdated Record last modified

smartbear swagger-codegen UPGRADE

Affected: < 2.4.19

Fixed in: 2.4.19

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy swagger-codegen || rpm -q swagger-codegen || swagger-codegen --version

2. UPGRADE to 2.4.19 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade swagger-codegen

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade swagger-codegen

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-21364?

swagger-codegen: upgrade to 2.4.19. Exact commands for each OS are on this page.

Is CVE-2021-21364 being exploited?

CVE-2021-21364 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-21364 affect?

CVE-2021-21364 affects swagger-codegen. Severity is medium (CVSS 5.3). 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

How urgent is CVE-2021-21364?

Priority 24/100. No elevated risk signals yet.

Related CVEs

CVE-2021-21363 MEDIUM 5.3 UPGRADE swagger-codegen is an open-source project which contains a template-driven engine to generate documentation, A
CVE-2017-1000208 HIGH 8.8 UPGRADE UPGRADE A vulnerability in Swagger-Parser's (version <= 1.0.30) yaml parsing functionality results in arbitrary code b
CVE-2017-1000207 HIGH 8.8 UPGRADE UPGRADE A vulnerability in Swagger-Parser's version <= 1.0.30 and Swagger codegen version <= 2.2.2 yaml parsing functi

References

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