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CVE-2021-41116

33
FAUCET Score

CVE-2021-41116 is a critical command injection vulnerability affecting Composer, the PHP dependency manager, specifically on Windows systems. It allows an attacker to execute arbitrary commands when a user installs untrusted dependencies, with no available workarounds. This vulnerability carries a CVSS score of 9.8 (Critical) due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code, the vulnerability has garnered significant community discussion, with 10 mentions across various platforms.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.10.23CPE matchmatch criteria
cpe:2.3:a:getcomposer:composer:*:*:*:*:*:*:*:*
>= 2.0.0, < 2.1.9CPE matchmatch criteria
cpe:2.3:a:getcomposer:composer:*:*:*:*:*:*:*:*
< 5.21.0CPE matchmatch criteria
cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.2HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
4.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.90%
Probability of exploitation in next 30 days
EPSS Percentile
85.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0290 is in the 76th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

composerpatch availablevia ghsa
Product: composer/composerFixed in: 1.10.23
composerpatch availablevia ghsa
Product: composer/composerFixed in: 2.1.9
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-frqg-7g38-6gcfhigh

Improper escaping of command arguments on Windows leading to command injection

Oct 5, 2021

References

github.com / composer/composer/commit/ca5e2f8d505fd3bfac6f7c85b82f2740becbc0aa
PatchThird Party Advisory
github.com / composer/composer/security/advisories/GHSA-frqg-7g38-6gcf
Third Party Advisory
sonarsource.com / blog/securing-developer-tools-package-managers