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CVE-2021-42561

37
FAUCET Score

CVE-2021-42561 is a critical command injection vulnerability affecting CALDERA version 2.8.1, specifically within its Human plugin. An authenticated attacker can exploit this by injecting shell metacharacters into the unsanitized 'name' parameter, leading to arbitrary shell command execution. With a CVSS score of 8.8 (High), this vulnerability allows for complete compromise of confidentiality, integrity, and availability with low attack complexity. While no public exploit code or active exploitation has been observed, and community discussion is minimal, the high FAUCET Risk Score of 85/100 indicates significant potential impact.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.8.1CPE matchmatch criteria
cpe:2.3:a:mitre:caldera:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
19.57%
Probability of exploitation in next 30 days
EPSS Percentile
97.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1957 is in the 96th percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

github.com / DrunkenShells/Disclosures/tree/master/CVE-2021-42561-Command%20Injection%20Via%20the%20Human%20Plugin-MITRE%20Caldera
ExploitThird Party Advisory
github.com / mitre/caldera/releases
Release NotesThird Party Advisory