CVE-2021-41840: Insyde INSYDEH2O

High severity, CVSS 8.2. EPSS: 0.3% chance of exploitation in the next 30 days.

An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. There is an SMM callout that allows an attacker to access the System Management Mode and execute arbitrary code. This occurs because of Inclusion of Functionality from an Untrusted Control Sphere.

Affected products

• Insyde INSYDEH2O: from 5.2, before 5.23.35 (fixed in 5.23.35); from 5.3, before 5.32.35 (fixed in 5.32.35); from 5.4, before 5.40.35 (fixed in 5.40.35)

Published 2022-02-03. Last modified 2026-08-11.