Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-21556

Severity CVSS v4.0:
Pending analysis
Type:
CWE-787 Out-of-bounds Write
Publication date:
14/06/2021
Last modified:
23/06/2021

Description

Dell PowerEdge R640, R740, R740XD, R840, R940, R940xa, MX740c, MX840c, and T640 Server BIOS contain a stack-based buffer overflow vulnerability in systems with NVDIMM-N installed. A local malicious user with high privileges may potentially exploit this vulnerability, leading to a denial of Service, arbitrary code execution, or information disclosure in UEFI or BIOS Preboot Environment.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 6.70 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
6.70
Severity 3.x
MEDIUM
Vector 2.0
AV:L/AC:L/Au:N/C:C/I:C/A:C CVSS v2.0 Severity and Metrics:

Base Score: 7.20 HIGH
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Attack Vector (AV): Local
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete

Base Score 2.0
7.20
Severity 2.0
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:dell:poweredge_r640_firmware:*:*:*:*:*:*:*:* 2.11.2 (excluding)
cpe:2.3:h:dell:poweredge_r640:-:*:*:*:*:*:*:*
cpe:2.3:o:dell:poweredge_r740_firmware:*:*:*:*:*:*:*:* 2.11.2 (excluding)
cpe:2.3:h:dell:poweredge_r740:-:*:*:*:*:*:*:*
cpe:2.3:o:dell:poweredge_r740xd_firmware:*:*:*:*:*:*:*:* 2.11.2 (excluding)
cpe:2.3:h:dell:poweredge_r740xd:-:*:*:*:*:*:*:*
cpe:2.3:o:dell:poweredge_r940_firmware:*:*:*:*:*:*:*:* 2.11.2 (excluding)
cpe:2.3:h:dell:poweredge_r940:-:*:*:*:*:*:*:*
cpe:2.3:o:dell:poweredge_r840_firmware:*:*:*:*:*:*:*:* 2.11.2 (excluding)
cpe:2.3:h:dell:poweredge_r840:-:*:*:*:*:*:*:*
cpe:2.3:o:dell:poweredge_r940xa_firmware:*:*:*:*:*:*:*:* 2.11.2 (excluding)
cpe:2.3:h:dell:poweredge_r940xa:-:*:*:*:*:*:*:*
cpe:2.3:o:dell:poweredge_t640_firmware:*:*:*:*:*:*:*:* 2.11.2 (excluding)
cpe:2.3:h:dell:poweredge_t640:-:*:*:*:*:*:*:*
cpe:2.3:o:dell:poweredge_mx740c_firmware:*:*:*:*:*:*:*:* 2.11.2 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools