CVE-2021-33841

CRITICALNVD 10.09.8▼

10.0

SGE-PLC1000 device, in its 0.9.2b firmware version, does not handle some requests correctly, allowing a remote attacker to inject code into the operating system with maximum privileges.

CVSS v3: 10.0
EG Score: 9.8(medium)
EPSS: 81.3%
KEV: Not listed

Published

June 9, 2021

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated May 23, 2026

No patch confirmed yet.

generic

Circutor SGE-PLC1000 OS command Injection | INCIBE-CERT | INCIBE

https://www.incibe.es/en/incibe-cert/notices/aviso-sci/circutor-sge-plc1000-os-command-injection

Weakness Classification(1)

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

CWE-78OS Command Injection

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 22:45 UTCepss_batch
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Frequently asked(5)

What is CVE-2021-33841?

CVE-2021-33841 is a critical vulnerability published on June 9, 2021. SGE-PLC1000 device, in its 0.9.2b firmware version, does not handle some requests correctly, allowing a remote attacker to inject code into the operating system with maximum privileges.

When was CVE-2021-33841 disclosed?

CVE-2021-33841 was first published in the National Vulnerability Database on June 9, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-33841 actively exploited?

CVE-2021-33841 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 81.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-33841?

CVE-2021-33841 has a CVSS v3 base score of 10.0 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.

How do I remediate CVE-2021-33841?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-33841, 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

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CVE-2021-33841

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

Circutor SGE-PLC1000 OS command Injection | INCIBE-CERT | INCIBE

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-33841?

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Frequently asked(5)

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