CVE-2021-3809

Potential security vulnerabilities have been identified in the BIOS (UEFI Firmware) for certain...

7.8 High

Potential security vulnerabilities have been identified in the BIOS (UEFI Firmware) for certain HP PC products, which might allow arbitrary code execution. HP is releasing firmware updates to mitigate these potential vulnerabilities.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.24%Down 2.3 points since Jan 31, 2023

What each source reports

NVD Score used 7.8

Record: CVE-2021-3809
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-269
Updated: 2026-11-02

CVE List 7.8

Record: CVE-2021-3809
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-269
Updated: 2026-11-02

EUVDEUVD-2021-27064 7.8

Record: EUVD-2021-27064
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-fvh7-79fr-wwcg 7.8

Potential security vulnerabilities have been identified in the BIOS (UEFI Firmware) for certain...

Record: GHSA-fvh7-79fr-wwcg
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-269
Updated: 2026-11-02

Affected products

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History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-3809 is a high vulnerability (CVSS 7.8) in Hp Elite Dragonfly Firmware, published January 30, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 15th percentile. No source names a fixed version.