---
id: CVE-2021-43615
title: >-
  An issue was discovered in HddPassword in Insyde InsydeH2O with kernel 5.1
  before 05.16.23, 5.2 before 05.26.23, 5.3 before 05.35.23, 5.4 before
  05.43.22, and 5.5 before 05.51.22
summary: >-
  An issue was discovered in HddPassword in Insyde InsydeH2O with kernel 5.1
  before 05.16.23, 5.2 before 05.26.23, 5.3 before 05.35.23, 5.4 before
  05.43.22, and 5.5 before 05.51.22. An SMM memory corruption vulnerability
  allows an attacker…
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-787
vendor: insyde
product: insydeh2o
affected:
  - 'insydeh2o >= 5.1, < 5.16.23'
  - 'insydeh2o >= 5.2, < 5.23.22'
  - 'insydeh2o >= 5.3, < 5.32.22'
patched:
  - insydeh2o 5.32.22
published: '2022-02-03'
updated: '2026-08-11'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-43615'
references:
  - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf'
    label: cve@mitre.org
  - url: 'https://security.netapp.com/advisory/ntap-20220216-0010/'
    label: cve@mitre.org
  - url: 'https://www.insyde.com/security-pledge'
    label: cve@mitre.org
  - url: 'https://www.insyde.com/security-pledge/SA-2022013'
    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-20220216-0010/'
    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-2022013'
    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: 0.00292
epssPercentile: 0.19408
ingestedAt: '2026-08-11T16:47:02.337Z'
---

## Overview

An issue was discovered in HddPassword in Insyde InsydeH2O with kernel 5.1 before 05.16.23, 5.2 before 05.26.23, 5.3 before 05.35.23, 5.4 before 05.43.22, and 5.5 before 05.51.22. An SMM memory corruption vulnerability allows an attacker to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.

## Affected

- `insydeh2o >= 5.1, < 5.16.23`
- `insydeh2o >= 5.2, < 5.23.22`
- `insydeh2o >= 5.3, < 5.32.22`

## Remediation

Upgrade past the affected range:

- `insydeh2o 5.32.22`