What is the CVSS score of CVE-2021-47816?

CVE-2021-47816 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Thecus N4800Eco NAS Server Control Panel are affected by CVE-2021-47816?

Organizations using Thecus N4800Eco NAS Server Control Panel face significant risk from CVE-2021-47816, a OS command injection vulnerability rated CVSS 8.8.

Is there a public PoC exploit available for CVE-2021-47816?

Yes, a public proof-of-concept exploit is available for CVE-2021-47816. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2021-47816?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Validate that input sanitization is in place for all user-controlled parameters.

Thecus N4800Eco NAS Server Control Panel CVE-2021-47816

HIGH

OS Command Injection (CWE-78)

2026-01-16 disclosure@vulncheck.com

Command Injection

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 26, 2026 - 15:05 vuln.today

Public exploit code

CVE Published

Jan 16, 2026 - 19:16 nvd

HIGH 8.8

DescriptionCVE.org

Thecus N4800Eco NAS Server Control Panel contains a command injection vulnerability that allows authenticated attackers to execute arbitrary system commands through user management endpoints. Attackers can inject commands via username and batch user creation parameters to execute shell commands with administrative privileges.

AnalysisAI

Technical ContextAI

Classified as CWE-78 (OS Command Injection). Thecus N4800Eco NAS Server Control Panel contains a command injection vulnerability that allows authenticated attackers to execute arbitrary system commands through user management endpoints. Attackers can inject commands via username and batch user creation parameters to execute shell commands with administrative privileges.

Affected ProductsAI

Component: user management.

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

CVE-2021-47816 vulnerability details – vuln.today

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Thecus N4800Eco NAS Server Control Panel CVE-2021-47816

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

Affected ProductsAI

RemediationAI

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External POC / Exploit Code