---
id: CVE-2021-41839
title: >-
  An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in
  Insyde InsydeH2O
summary: >-
  An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in
  Insyde InsydeH2O. Because of an Untrusted Pointer Dereference that causes SMM
  memory corruption, an attacker may be able to write fixed or predictable data
  to SMRA…
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'
cwe:
  - CWE-119
vendor: insyde
product: insydeh2o
affected:
  - 'insydeh2o >= 5.1, < 5.16.25'
  - 'insydeh2o >= 5.2, < 5.26.25'
  - 'insydeh2o >= 5.3, < 5.35.25'
  - 'insydeh2o >= 5.4, < 5.43.25'
  - 'insydeh2o >= 5.5, < 5.51.25'
patched:
  - insydeh2o 5.51.25
published: '2022-02-03'
updated: '2026-08-11'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-41839'
references:
  - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf'
    label: cve@mitre.org
  - url: 'https://security.netapp.com/advisory/ntap-20220217-0016/'
    label: cve@mitre.org
  - url: 'https://www.insyde.com/security-pledge'
    label: cve@mitre.org
  - url: 'https://www.insyde.com/security-pledge/SA-2022020'
    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-20220217-0016/'
    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-2022020'
    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: 0.00275
epssPercentile: 0.17782
ingestedAt: '2026-08-11T16:47:02.046Z'
---

## Overview

An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. Because of an Untrusted Pointer Dereference that causes SMM memory corruption, an attacker may be able to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.

## Affected

- `insydeh2o >= 5.1, < 5.16.25`
- `insydeh2o >= 5.2, < 5.26.25`
- `insydeh2o >= 5.3, < 5.35.25`
- `insydeh2o >= 5.4, < 5.43.25`
- `insydeh2o >= 5.5, < 5.51.25`

## Remediation

Upgrade past the affected range:

- `insydeh2o 5.51.25`