CVE-2021-38578

Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.

CVSS v3 7.4 HIGH
CVSS v2.0 7.5 HIGH

7.4^/10

CVSS v3 : HIGH

Vector :

Exploitability : 0.8 / Impact : 6.0

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact LOW

Scope CHANGED

7.5^/10

CVSS v2.0 : HIGH

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

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://bugzilla.tianocore.org/show_bug.cgi?id=3387	Issue Tracking Vendor Advisory
https://www.insyde.com/security-pledge/SA-2023024	Third Party Advisory
https://bugzilla.tianocore.org/show_bug.cgi?id=3387	Issue Tracking Vendor Advisory
https://lists.debian.org/debian-lts-announce/2025/06/msg00007.html
https://www.insyde.com/security-pledge/SA-2023024	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:tianocore:edk2:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:o:insyde:kernel:5.0:::::::*
	cpe:2.3:o:insyde:kernel:5.1:::::::*
	cpe:2.3:o:insyde:kernel:5.2:::::::*
	cpe:2.3:o:insyde:kernel:5.3:::::::*
	cpe:2.3:o:insyde:kernel:5.4:::::::*
	cpe:2.3:o:insyde:kernel:5.5:::::::*

History

03 Nov 2025, 20:15

Type	Values Removed	Values Added
References		() https://lists.debian.org/debian-lts-announce/2025/06/msg00007.html -

Information

Published : 2022-03-03 22:15

Updated : 2025-11-03 20:15

NVD link : CVE-2021-38578

Mitre link : CVE-2021-38578

CVE.ORG link : CVE-2021-38578

JSON object : View

Products Affected

tianocore

edk2

insyde

kernel

CWE

CWE-124

Buffer Underwrite ('Buffer Underflow')

CWE-787

Out-of-bounds Write

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