CVE-2021-42171

HIGH

Zenario CMS 9.0.54156 is vulnerable to File Upload. The web server can be compromised by uploading and executing a web-shell which can run commands, browse system files, browse local resources, att...

Affects 1 product across 1 vendor.

CVSS 3.17.2
EPSS2.5%
Percentile85th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, high privileges required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-434: Unrestricted Upload of File with Dangerous Type

Application allows file uploads without validating type, enabling upload of executable code or web shells.

Related Attack Patterns (CAPEC)
CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs
via CWE-434

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ AI Analysis — automated analysis, not human-reviewed

Zenario CMS 9.0.54156 is vulnerable to a file upload vulnerability that allows an attacker to upload and execute a web shell, potentially compromising the web server and enabling further attacks.

BSID: BS-2022-GLOBAL-299091-H • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

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Frequently Asked Questions
What is CVE-2021-42171?
Zenario CMS 9.0.54156 is vulnerable to a file upload vulnerability that allows an attacker to upload and execute a web shell, potentially compromising the web server and enabling further attacks.
What is the CVSS score for CVE-2021-42171?
CVE-2021-42171 has CVSS 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. EPSS: 2.5%.
Is CVE-2021-42171 actively exploited?
No confirmed active exploitation of CVE-2021-42171 as of 2026-09-25.
How do I remediate CVE-2021-42171?
Priority: IMMEDIATE.
What systems are affected by CVE-2021-42171?
CVE-2021-42171 affects Tribalsystems Zenario.
Vulnerability Details
CVE IDCVE-2021-42171
BSIDBS-2022-GLOBAL-299091-H BreachSpider Global ID
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published2022-03-14
Last Modified2026-06-17
ICS Relevance0%
Weakness (CWE)
SourceNVD
Official Description

Zenario CMS 9.0.54156 is vulnerable to File Upload. The web server can be compromised by uploading and executing a web-shell which can run commands, browse system files, browse local resources, attack other servers, and exploit the local vulnerabilities, and so forth.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

An attacker can exploit the file upload functionality to upload a malicious web shell. Once uploaded, the web shell can be executed to run arbitrary commands, browse system files, access local resources, and potentially attack other servers or exploit local vulnerabilities.

Exploitation Likelihood: HIGH

Affected Products
VendorProductAffected Versions
Tribalsystems Zenario 9.0.54156
Remediation

No official vendor advisory link on record. See the CVE record →

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 1676 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Model/workspace/models/qwen2.5-coder-32b-instruct-bf16
ConfidenceHIGH
Enriched At2026-05-24
SHA-512 Audit Hash64e516dac68e226595c206d7db0de4633f60212e2f6496119c6c8e1e59ed4164c2f27ec1b6378d8ae6045a1ae6289e1f51dbfcb754b46737ba01dd19365e52b6
Related CVEs affecting Tribalsystems
CVE-2022-44136 9.8 Zenario CMS 9.3.57186 is vulnerable to Remote Code Excution (RCE). CVE-2021-26830 9.1 SQL Injection in Tribalsystems Zenario CMS 8.8.52729 allows remote attackers ... CVE-2018-5960 8.8 Zenario v7.1 - v7.6 has SQL injection via the `Name` input field of organizer... CVE-2018-18420 8.8 Cross-Site Request Forgery (CSRF) vulnerability was discovered in the 8.3 ver... CVE-2022-23043 7.2 Zenario CMS 9.2 allows an authenticated admin user to bypass the file upload ...
View all Tribalsystems CVEs →

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