CVE-2021-41116

Name: CVE-2021-41116
Creator: NVD / NIST
Published: 2021-10-05T18:15:08.407+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.90%

Last modified Jun 17, 2026

CVE-2021-41116 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Composer is an open source dependency manager for the PHP language. In affected versions windows users running Composer to install untrusted dependencies are subject to command injection and should upgrade their composer version. EPSS estimates a 2.90% chance of exploitation in the next 30 days.

Description

Composer is an open source dependency manager for the PHP language. In affected versions windows users running Composer to install untrusted dependencies are subject to command injection and should upgrade their composer version. Other OSs and WSL are not affected. The issue has been resolved in composer versions 1.10.23 and 2.1.9. There are no workarounds for this issue.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.90%

85.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Getcomposer	Composer	< 1.10.23
Getcomposer	Composer	>= 2.0.0, < 2.1.9
Tenable	Tenable.Sc	< 5.21.0

References

https://github.com/composer/composer/commit/ca5e2f8d505fd3bfac6f7c85b82f2740becbc0aaPatch, Third Party Advisory
https://github.com/composer/composer/security/advisories/GHSA-frqg-7g38-6gcfThird Party Advisory
https://www.sonarsource.com/blog/securing-developer-tools-package-managers/
https://github.com/composer/composer/commit/ca5e2f8d505fd3bfac6f7c85b82f2740becbc0aaPatch, Third Party Advisory
https://github.com/composer/composer/security/advisories/GHSA-frqg-7g38-6gcfThird Party Advisory
https://www.sonarsource.com/blog/securing-developer-tools-package-managers/

Timeline

Published: Oct 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41116?

How severe is CVE-2021-41116?

CVE-2021-41116 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.90% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41116?

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-2021-41116?

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

Scan your code now

Source: NVD / NIST