Dell Client BIOS Multiple Vulnerabilities (DSA-2021-106)

high Nessus Plugin ID 153223
New! Plugin Severity Now Using CVSS v3

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The remote device is missing a vendor-supplied security patch


According to its self-reported version, Dell BIOS is affected by multiple vulnerabilities.

- Dell UEFI BIOS https stack leveraged by the Dell BIOSConnect feature and Dell HTTPS Boot feature contains an improper certificate validation vulnerability. A remote unauthenticated attacker may exploit this vulnerability using a person-in-the-middle attack which may lead to a denial of service and payload tampering. (CVE-2021-21571)

- 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.
(CVE-2021-21572, CVE-2021-21573, CVE-2021-21574)

Please see the included Dell Security Advisory for more information.


Check vendor advisory.

See Also

Plugin Details

Severity: High

ID: 153223

File Name: dell_bios_dsa-2021-106.nasl

Version: 1.2

Type: local

Agent: windows

Family: Windows

Published: 9/13/2021

Updated: 9/14/2021

Dependencies: bios_get_info_wmi.nbin

Risk Information

CVSS Score Source: CVE-2021-21574


Risk Factor: High

Score: 8.1


Risk Factor: Medium

Base Score: 6.9

Temporal Score: 5.1

Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:microsoft:windows

Required KB Items: Bios/

Exploit Ease: No known exploits are available

Patch Publication Date: 6/24/2020

Vulnerability Publication Date: 6/24/2020

Reference Information

CVE: CVE-2021-21571, CVE-2021-21572, CVE-2021-21573, CVE-2021-21574

IAVA: 2021-A-0294

CWE: 121, 122, 295, 787