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CVE-2021-38578 | Mondoo Vulnerability Intelligence

Vulnerability IntelligenceCVE-2021-38578

CVE-2021-38578

HIGH7.4

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

Published Mar 3, 2022

Modified 5 months ago

Details

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

References

https://bugzilla.tianocore.org/show_bug.cgi?id=3387

https://lists.debian.org/debian-lts-announce/2025/06/msg00007.html

https://www.cve.org/CVERecord?id=CVE-2021-38578

https://www.insyde.com/security-pledge/SA-2023024

CVSS Analysis

CVSS v3.1

7.4

Exploitability

Attack Vector

LocalAV:L

Attack Complexity

HighAC:H

Privileges Required

HighPR:H

User Interaction

NoneUI:N

Scope

Scope

ChangedS:C

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

LowA:L

7.4/CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L

Weakness Type (CWE)

Other

Ecosystems

Timeline

PublishedMar 3, 2022

ModifiedNov 3, 2025