CVE-2021-33626

Published Oct 1, 2021 CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Description
A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer(QWORD values for CommBuffer). This can be used by an attacker to corrupt data in SMRAM memory and even lead to arbitrary code execution.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
EUVD EUVD EUVD-2021-20303 A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer(QWORD values for CommBuffer). This can be used by an attacker to corrupt data in SMRAM memory and even lead to arbitrary code execution.
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Aug 11, 2026, 12:22 PM
Reserved
May 28, 2021, 12:00 AM
Status
Modified
Published
Oct 1, 2021, 3:15 AM
Modified
Aug 11, 2026, 1:17 PM