CVE-2021-38578

moderate-risk
Published 2022-03-03

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

Do I need to act?

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0.06% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.4/10 High
LOCAL / HIGH complexity

Affected Products (7)

Affected Vendors

Insyde Tianocore

References (5)

Issue Tracking https://bugzilla.tianocore.org/show_bug.cgi?id=3387
Third Party Advisory https://www.insyde.com/security-pledge/SA-2023024
Issue Tracking https://bugzilla.tianocore.org/show_bug.cgi?id=3387
https://lists.debian.org/debian-lts-announce/2025/06/msg00007.html
Third Party Advisory https://www.insyde.com/security-pledge/SA-2023024
33
/ 100
moderate-risk
Severity 19/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 14/34 · Moderate