What is CVE-2021-47816?

CVE-2021-47816 is a high-severity vulnerability in Thecus N4800eco Nas Server Control Panel, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-01-16.

How severe is CVE-2021-47816?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Thecus N4800eco Nas Server Control Panel

CVE-2021-47816

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.

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.017 (75.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Thecus N4800eco Nas Server Control Panel — versions N4800Eco

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

ExploitDB-49926 (exploit)
Thecus Official Vendor Homepage (product)
Thecus N4800Eco Product Page (product)
Researcher Blog (technical-description, exploit)
VulnCheck Advisory: Thecus N4800Eco Nas Server Control Panel - Command Injection (third-party-advisory)

Frequently asked questions

What is CVE-2021-47816?: CVE-2021-47816 is a high-severity vulnerability in Thecus N4800eco Nas Server Control Panel, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-01-16.
How severe is CVE-2021-47816?: High severity. CVSS v3 base score is 8.8 out of 10.