CVE-2021-21574

Dell BIOSConnect feature contains a buffer overflow vulnerability. An authenticated malicious...

7.2 High

Dell BIOSConnect feature contains a buffer overflow vulnerability. An authenticated malicious admin user with local access to the system may potentially exploit this vulnerability to run arbitrary code and bypass UEFI restrictions.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: High
Privileges needed: High
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.29%Up 0.1 points since Jun 25, 2021

What each source reports

CVE List Score used 7.2

Record: CVE-2021-21574
CVSS 3.1: 7.2 HighCVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
Weakness: CWE-121
Updated: 2026-11-02

EUVDEUVD-2021-8846 7.2

Record: EUVD-2021-8846
CVSS 3.1: 7.2 HighCVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-666g-rqqj-3462 No score

Dell BIOSConnect feature contains a buffer overflow vulnerability. An authenticated malicious...

Record: GHSA-666g-rqqj-3462
Weakness: CWE-787
Updated: 2026-11-02

NVD 7.2

Record: CVE-2021-21574
CVSS 3.1: 7.2 HighCVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
CVSS 3.1: 7.5 HighCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS 2.0: 6.9 MediumAV:L/AC:M/Au:N/C:C/I:C/A:C
Weakness: CWE-121, CWE-787
Updated: 2026-11-02

Affected products

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History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

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

In short

CVE-2021-21574 is a high vulnerability (CVSS 7.2) in Dell Biosconnect, published June 24, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.29%, the 21st percentile. No source names a fixed version.