CVE-2021-45971

Severity CVSS v4.0:

Pending analysis

Type:

CWE-787 Out-of-bounds Write

Publication date:

06/01/2022

Last modified:

04/11/2025

Description

An issue was discovered in SdHostDriver in Insyde InsydeH2O with kernel 5.1 before 05.16.25, 5.2 before 05.26.25, 5.3 before 05.35.25, 5.4 before 05.43.25, and 5.5 before 05.51.25. A vulnerability exists in the SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer (CommBufferData).

Impact

Vector 3.x

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

Base Score: 8.20 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

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

Base Score 3.x

8.20

Severity 3.x

HIGH

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:a:insyde:insydeh2o::::::::	5.1 (including)	5.16.25 (excluding)
cpe:2.3:a:insyde:insydeh2o::::::::	5.2 (including)	5.26.25 (excluding)
cpe:2.3:a:insyde:insydeh2o::::::::	5.3 (including)	5.35.25 (excluding)
cpe:2.3:a:insyde:insydeh2o::::::::	5.4 (including)	5.43.25 (excluding)
cpe:2.3:a:insyde:insydeh2o::::::::	5.5 (including)	05.51.25 (excluding)

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

CVE-2021-45971

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools