---
id: CVE-2021-41379
title: Windows Installer Elevation of Privilege Vulnerability
summary: Windows Installer Elevation of Privilege Vulnerability
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-59
  - CWE-59
vendor: microsoft
product: windows_10_1507
affected:
  - windows_10_1507 < 10.0.10240.19119
  - windows_10_1607 < 10.0.14393.4770
  - windows_10_1809 < 10.0.17763.2300
  - windows_10_1909 < 10.0.18363.1916
  - windows_10_2004 < 10.0.19041.1348
  - windows_10_20h2 < 10.0.19042.1348
  - windows_10_21h1 < 10.0.19043.1348
  - windows_11_21h2 < 10.0.22000.318
  - windows_7
  - windows_8.1
  - windows_rt_8.1
  - windows_server_2004 < 10.0.19041.1348
  - windows_server_2008
  - windows_server_2008 = r2
  - windows_server_2012
  - windows_server_2012 = r2
  - windows_server_2016 < 10.0.14393.4770
  - windows_server_2019 < 10.0.17763.2300
  - windows_server_2022 < 10.0.20348.350
  - windows_server_20h2 < 10.0.19042.1348
patched:
  - windows_10_1507 10.0.10240.19119
  - windows_10_1607 10.0.14393.4770
  - windows_10_1809 10.0.17763.2300
  - windows_10_1909 10.0.18363.1916
  - windows_10_2004 10.0.19041.1348
  - windows_10_20h2 10.0.19042.1348
  - windows_10_21h1 10.0.19043.1348
  - windows_11_21h2 10.0.22000.318
  - windows_server_2004 10.0.19041.1348
  - windows_server_2016 10.0.14393.4770
  - windows_server_2019 10.0.17763.2300
  - windows_server_2022 10.0.20348.350
  - windows_server_20h2 10.0.19042.1348
published: '2021-11-10'
updated: '2026-08-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-41379'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41379'
    label: secure@microsoft.com
  - url: >-
      https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41379
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.zerodayinitiative.com/advisories/ZDI-21-1308/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41379
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
epss: 0.19532
epssPercentile: 0.97256
kev: true
kevDateAdded: '2022-03-03'
kevDueDate: '2022-03-17'
kevRansomware: true
exploited: true
zeroDay: true
ingestedAt: '2026-08-20T17:59:03.274Z'
---

## Overview

Windows Installer Elevation of Privilege Vulnerability

## Affected

- `windows_10_1507 < 10.0.10240.19119`
- `windows_10_1607 < 10.0.14393.4770`
- `windows_10_1809 < 10.0.17763.2300`
- `windows_10_1909 < 10.0.18363.1916`
- `windows_10_2004 < 10.0.19041.1348`
- `windows_10_20h2 < 10.0.19042.1348`
- `windows_10_21h1 < 10.0.19043.1348`
- `windows_11_21h2 < 10.0.22000.318`
- `windows_7`
- `windows_8.1`
- `windows_rt_8.1`
- `windows_server_2004 < 10.0.19041.1348`
- `windows_server_2008`
- `windows_server_2008 = r2`
- `windows_server_2012`
- `windows_server_2012 = r2`
- `windows_server_2016 < 10.0.14393.4770`
- `windows_server_2019 < 10.0.17763.2300`
- `windows_server_2022 < 10.0.20348.350`
- `windows_server_20h2 < 10.0.19042.1348`

## Remediation

Upgrade past the affected range:

- `windows_10_1507 10.0.10240.19119`
- `windows_10_1607 10.0.14393.4770`
- `windows_10_1809 10.0.17763.2300`
- `windows_10_1909 10.0.18363.1916`
- `windows_10_2004 10.0.19041.1348`
- `windows_10_20h2 10.0.19042.1348`
- `windows_10_21h1 10.0.19043.1348`
- `windows_11_21h2 10.0.22000.318`
- `windows_server_2004 10.0.19041.1348`
- `windows_server_2016 10.0.14393.4770`
- `windows_server_2019 10.0.17763.2300`
- `windows_server_2022 10.0.20348.350`
- `windows_server_20h2 10.0.19042.1348`