VULNERABILITY INTELLIGENCE

CVE-2021-33626

CVSS score7.8 HIGH
EPSS probability0.31%
CISA KEVNot currently listed
Published2021-10-01
Last modified2026-08-11
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

  • CWE-829: Inclusion of Functionality from Untrusted Control Sphere

Primary references