CVE-2021-21423: `projen` is a project generation tool that synthesizes project configuration files such as `package.json`, `ts

Q: How do I fix CVE-2021-21423?

projen: upgrade to 0.16.41. Exact commands for each OS are on this page.

Q: Is CVE-2021-21423 being exploited?

CVE-2021-21423 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-2021-21423 affect?

CVE-2021-21423 affects projen. Severity is medium (CVSS 6.8). `projen` is a project generation tool that synthesizes project configuration files such as `package.json`, `tsconfig.json`, `.gitignore`, GitHub Workflows, `eslint`, `jest`, and more, from a well-typed definition written in JavaScript. User

Q: How urgent is CVE-2021-21423?

Priority 42/100. No elevated risk signals yet.

This month

MEDIUM 6.8UPGRADE

CVE-2021-21423 is a medium-severity flaw (CVSS 6.8) affecting projen. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

`projen` is a project generation tool that synthesizes project configuration files such as `package.json`, `tsconfig.json`, `.gitignore`, GitHub Workflows, `eslint`, `jest`, and more, from a well-typed definition written in JavaScript. Users of projen's `NodeProject` project type (including any project type derived from it) include a `.github/workflows/rebuild-bot.yml` workflow that may allow any GitHub user to trigger execution of un-trusted cod

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-527
Published	2021-04-06
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: projen project

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

Am I affected?

Timeline

2021-04-06 19:15 UTCPublished CVE record published
2026-06-17 03:35 UTCUpdated Record last modified

projen project projen UPGRADE

Affected: >= 0.6.0 and < 0.16.41

Fixed in: 0.16.41

Safe to downgrade to: a release before 0.6.0

1. Check installed version

npm ls projen

2. UPGRADE to 0.16.41

npm install projen@">=0.16.41"

3. If no update is available yet, DOWNGRADE to a release before 0.6.0

npm view projen versions npm install projen@"<0.6.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2021-21423?

projen: upgrade to 0.16.41. Exact commands for each OS are on this page.

Is CVE-2021-21423 being exploited?

CVE-2021-21423 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-2021-21423 affect?

CVE-2021-21423 affects projen. Severity is medium (CVSS 6.8). `projen` is a project generation tool that synthesizes project configuration files such as `package.json`, `tsconfig.json`, `.gitignore`, GitHub Workflows, `eslint`, `jest`, and more, from a well-typed definition written in JavaScript. User

How urgent is CVE-2021-21423?

Priority 42/100. No elevated risk signals yet.

Software pages

GitHub vulnerabilities

References

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