CVE-2021-38578

CRITICAL
Published Mar 3, 20224y ago · Modified Jun 17, 20262w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Mar 3, 2022 4y ago
Last Modified Jun 17, 2026 2w ago

Description

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

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 2

CWE-124
CWE-787 Out-of-bounds Write Memory Safety

Affected Products 7

VendorProductVersionRange
tianocoreedk2* ≤202202
insydekernel5.0any
insydekernel5.1any
insydekernel5.2any
insydekernel5.3any
insydekernel5.4any
insydekernel5.5any

References 3

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.