---
id: CVE-2021-42060
title: >-
  An issue was discovered in Insyde InsydeH2O Kernel 5.0 through 05.08.41,
  Kernel 5.1 through 05.16.41, Kernel 5.2 before 05.23.22, and Kernel 5.3 before
  05.32.22
summary: >-
  An issue was discovered in Insyde InsydeH2O Kernel 5.0 through 05.08.41,
  Kernel 5.1 through 05.16.41, Kernel 5.2 before 05.23.22, and Kernel 5.3 before
  05.32.22. An Int15ServiceSmm SMM callout vulnerability allows an attacker to
  hijack e…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'
vendor: insyde
product: insydeh2o
affected:
  - 'insydeh2o >= 5.2, < 5.23.35'
  - 'insydeh2o >= 5.3, < 5.32.35'
  - 'insydeh2o >= 5.1, < 5.16.42'
  - 'insydeh2o >= 5.0, < 05.08.49'
patched:
  - insydeh2o 05.08.49
published: '2022-02-03'
updated: '2026-08-11'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-42060'
references:
  - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf'
    label: cve@mitre.org
  - url: 'https://security.netapp.com/advisory/ntap-20220217-0015/'
    label: cve@mitre.org
  - url: 'https://www.insyde.com/security-pledge'
    label: cve@mitre.org
  - url: 'https://www.insyde.com/security-pledge/SA-2022007'
    label: cve@mitre.org
  - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20220217-0015/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.insyde.com/security-pledge'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.insyde.com/security-pledge/SA-2022007'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.kb.cert.org/vuls/id/796611'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-306654.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.00353
epssPercentile: 0.26285
ingestedAt: '2026-08-11T16:47:02.191Z'
---

## Overview

An issue was discovered in Insyde InsydeH2O Kernel 5.0 through 05.08.41, Kernel 5.1 through 05.16.41, Kernel 5.2 before 05.23.22, and Kernel 5.3 before 05.32.22. An Int15ServiceSmm SMM callout vulnerability allows an attacker to hijack execution flow of code running in System Management Mode. Exploiting this issue could lead to escalating privileges to SMM.

## Affected

- `insydeh2o >= 5.2, < 5.23.35`
- `insydeh2o >= 5.3, < 5.32.35`
- `insydeh2o >= 5.1, < 5.16.42`
- `insydeh2o >= 5.0, < 05.08.49`

## Remediation

Upgrade past the affected range:

- `insydeh2o 05.08.49`