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.
CVE-2021-47816
HIGHNVD 8.88.8—Elevated
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
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.
- 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 computedSeverity88% × 45%Exploitation40% × 40%Automatability0% × 15%Action: Watch closely — could escalate to Attend. - EPSS PROB
- 2%
- EPSS %ILE
- 78%
- KEV
- Not listed
Published
January 16, 2026
Last Modified
July 28, 2026
References (5)
- linkhttps://www.exploit-db.com/exploits/49926
- linkhttp://www.thecus.com/
- linkhttp://www.thecus.com/product.php?PROD_ID=83
- linkhttps://docs.unsafe-inline.com/0day/thecus-n4800eco-nas-server-control-panel-comand-injection
- linkhttps://www.vulncheck.com/advisories/thecus-neco-nas-server-control-panel-command-injection
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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 22.1% 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.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2021-47816
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