CVE-2021-47816

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory published 2026-01-16. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 8.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track*)
EG Risk 56/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
2%
EPSS %ILE
74%
KEV
Not listed

Published

January 16, 2026

Last Modified

July 28, 2026

Advisory Details (5)

Auto-updated May 21, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Thecus N4800Eco Nas Server Control Panel - Command Injection | Advisories | VulnCheck

https://www.vulncheck.com/advisories/thecus-neco-nas-server-control-panel-command-injection
generic🟡 PoC Available

Thecus N4800Eco Nas Server Control Panel - Comand Injection - Hardware webapps Exploit

https://www.exploit-db.com/exploits/49926
generic

Thecus N4800Eco Nas Server Control Panel Comand Injection | UI

https://docs.unsafe-inline.com/0day/thecus-n4800eco-nas-server-control-panel-comand-injection
generic

Thecus NAS: Empowering Professionals. Rackmount NAS, Tower NAS, SMB NAS, SOHO NAS

http://www.thecus.com/product.php?PROD_ID=83
generic

Thecus NAS: Empowering Professionals. Rackmount NAS, Tower NAS, SMB NAS, SOHO NAS

http://www.thecus.com/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 132 total refreshes for this CVE.

  1. 2026-07-28 15:33 UTCEPSS rescore
  2. 2026-07-28 02:27 UTCEG score recompute
  3. 2026-07-28 02:27 UTCGHSA enrichment
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  9. 2026-07-23 02:06 UTCEG score recompute
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  74. 2026-05-28 13:43 UTCEPSS rescore
  75. 2026-05-27 13:39 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2021-47816?
CVE-2021-47816 is a high vulnerability published on January 16, 2026. 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…
When was CVE-2021-47816 disclosed?
CVE-2021-47816 was first published in the National Vulnerability Database on January 16, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47816 actively exploited?
CVE-2021-47816 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 26.3% of all scored CVEs.
What is the CVSS score of CVE-2021-47816?
CVE-2021-47816 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-47816?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47816, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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