CVE-2021-36283

Dell BIOS contains an improper input validation vulnerability. A local authenticated malicious...

7.5 High

Dell BIOS contains an improper input validation vulnerability. A local authenticated malicious user may potentially exploit this vulnerability by using an SMI to gain arbitrary code execution in SMRAM.

Attack profile

How easy it is to exploit

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

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.25%Down 0.1 points since Sep 29, 2021

What each source reports

CVE List Score used 7.5

Record: CVE-2021-36283
CVSS 3.1: 7.5 HighCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-20
Updated: 2026-11-02

EUVDEUVD-2021-22903 7.5

Record: EUVD-2021-22903
CVSS 3.1: 7.5 HighCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-v8xg-293g-mwp4 No score

Dell BIOS contains an improper input validation vulnerability. A local authenticated malicious...

Record: GHSA-v8xg-293g-mwp4
Weakness: CWE-20
Updated: 2026-11-02

NVD 7.5

Record: CVE-2021-36283
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 3.1: 6.7 MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.2 HighAV:L/AC:L/Au:N/C:C/I:C/A:C
Weakness: CWE-20
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-2021-36283 is a high vulnerability (CVSS 7.5) in Dell Chengming 3990 Firmware, published September 28, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.25%, the 16th percentile. No source names a fixed version.