CVE-2021-3661

HIGHNVD 8.48.4—

8.4

A potential security vulnerability has been identified in certain HP Workstation BIOS (UEFI firmware) which may allow arbitrary code execution. HP is releasing firmware mitigations for the potential vulnerability.

CVSS v3: 8.4
EG Score: 8.4(medium)
EPSS: 48.2%
KEV: Not listed

Published

December 12, 2022

Last Modified

April 29, 2025

References (2)

hp-security-alert@hphttps://support.hp.com/us-en/document/ish_5670997-5671021-16/hpsbhf03770
af854a3a-2127-422b-91ae-364da2661108https://support.hp.com/us-en/document/ish_5670997-5671021-16/hpsbhf03770

Weakness Classification(1)

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

CWE-94Improper Control of Generation of Code (Code 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.

2026-06-06 13:46 UTCepss_batch
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2026-05-27 13:39 UTCepss_batch
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Frequently asked(5)

What is CVE-2021-3661?

CVE-2021-3661 is a high vulnerability published on December 12, 2022. A potential security vulnerability has been identified in certain HP Workstation BIOS (UEFI firmware) which may allow arbitrary code execution. HP is releasing firmware mitigations for the potential vulnerability.

When was CVE-2021-3661 disclosed?

CVE-2021-3661 was first published in the National Vulnerability Database on December 12, 2022, with the most recent update on April 29, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-3661 actively exploited?

CVE-2021-3661 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 48.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-3661?

CVE-2021-3661 has a CVSS v3 base score of 8.4 (NVD).

How do I remediate CVE-2021-3661?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-3661, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-3661

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Is Your Infrastructure Affected by CVE-2021-3661?

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Frequently asked(5)

What is CVE-2021-3661?

When was CVE-2021-3661 disclosed?

Is CVE-2021-3661 actively exploited?

What is the CVSS score of CVE-2021-3661?

CVE-2021-3661 has a CVSS v3 base score of 8.4 (NVD).

How do I remediate CVE-2021-3661?

CVE-2021-3661

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-3661?

CVE-2021-3661

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-3661?

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Frequently asked(5)

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