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CVE-2021-42171

24
FAUCET Score

CVE-2021-42171 describes a critical file upload vulnerability in Zenario CMS version 9.0.54156, allowing authenticated attackers to upload and execute web-shells. This vulnerability carries a CVSS score of 7.2 (High), indicating a high potential for complete compromise of confidentiality, integrity, and availability due to its low attack complexity and network-based vector. While the vulnerability is severe, there is currently no evidence of active exploitation, public exploit code, or significant community discussion, suggesting it is not widely targeted.

Impacted Technologies

VendorProductVersion(s)CPE
9.0.54156CPE matchmatch criteria
cpe:2.3:a:tribalsystems:zenario:9.0.54156:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.2HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.48%
Probability of exploitation in next 30 days
EPSS Percentile
82.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0248 is in the 80th percentile among its peer group of 5,531 CVEs.

Social Chatter

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

Patch Available

Vendor Patches (1)

composerpatch availablevia ghsa
Product: tribalsystems/zenarioFixed in: 9.0.55143

Vendor Advisories (1)

composerGHSA-rgg3-3wh7-w935critical

Unrestricted Upload of File with Dangerous Type in Zenario CMS

Mar 15, 2022

References

packetstormsecurity.com / files/166617/Zenario-CMS-9.0.54156-Remote-Code-Execution.html
ExploitThird Party Advisory
github.com / hieuminhnv/Zenario-CMS-9.0-last-version/issues/2
ExploitIssue TrackingThird Party Advisory
minhnq22.medium.com / file-upload-to-rce-on-zenario-9-0-54156-cms-fa05fcc6cf74
Third Party Advisory