CVE-2021-41167

Name: CVE-2021-41167
Creator: NVD / NIST
Published: 2021-10-20T19:15:07.57+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.62%

Last modified Jun 17, 2026

CVE-2021-41167 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. modern-async is an open source JavaScript tooling library for asynchronous operations using async/await and promises. In affected versions a bug affecting two of the functions in this library: forEachSeries and forEachLimit. EPSS estimates a 1.62% chance of exploitation in the next 30 days.

Description

modern-async is an open source JavaScript tooling library for asynchronous operations using async/await and promises. In affected versions a bug affecting two of the functions in this library: forEachSeries and forEachLimit. They should limit the concurrency of some actions but, in practice, they don't. Any code calling these functions will be written thinking they would limit the concurrency but they won't. This could lead to potential security issues in other projects. The problem has been patched in 1.0.4. There is no workaround.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.62%

73.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Modern-Async Project	Modern-Async	< 1.0.4

References

https://github.com/nicolas-van/modern-async/commit/0010d28de1b15d51db3976080e26357fa7144436Patch, Third Party Advisory
https://github.com/nicolas-van/modern-async/issues/5Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/nicolas-van/modern-async/security/advisories/GHSA-3pcq-34w5-p4g2Third Party Advisory
https://github.com/nicolas-van/modern-async/commit/0010d28de1b15d51db3976080e26357fa7144436Patch, Third Party Advisory
https://github.com/nicolas-van/modern-async/issues/5Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/nicolas-van/modern-async/security/advisories/GHSA-3pcq-34w5-p4g2Third Party Advisory

Timeline

Published: Oct 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41167?

How severe is CVE-2021-41167?

CVE-2021-41167 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.62% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41167?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41167?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST