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CVE-2021-42559

27
FAUCET Score

CVE-2021-42559 affects CALDERA 2.8.1, allowing an authenticated user to achieve arbitrary command execution upon server restart. This is due to the ability to modify startup "requirements" via the REST API, which then execute the inserted commands. With a CVSS score of 8.8 (HIGH), this vulnerability presents a significant risk, enabling full compromise of confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

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
1.96%
Probability of exploitation in next 30 days
EPSS Percentile
78.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0196 is in the 77th percentile among its peer group of 17,829 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-2021-42559-Command%20Injection%20Via%20Configurations-MITRE%20Caldera
ExploitThird Party Advisory
github.com / mitre/caldera/releases
Release Notes