---
id: CVE-2021-42287
title: Active Directory Domain Services Elevation of Privilege Vulnerability
summary: Active Directory Domain Services Elevation of Privilege Vulnerability
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: microsoft
product: windows_server_2008
affected:
  - windows_server_2008
  - windows_server_2008 = r2
  - windows_server_2012
  - windows_server_2012 = r2
  - windows_server_2016 < 10.0.14393.4770
  - windows_server_2016 = 2004
  - windows_server_2019 < 10.0.17763.2300
  - windows_server_2022 < 10.0.20348.350
patched:
  - windows_server_2016 10.0.14393.4770
  - windows_server_2019 10.0.17763.2300
  - windows_server_2022 10.0.20348.350
published: '2021-11-10'
updated: '2026-08-06'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-42287'
references:
  - url: >-
      https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42287
    label: secure@microsoft.com
  - url: >-
      https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42287
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42287
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
  - exploit-available
epss: 0.7717
epssPercentile: 0.99539
kev: true
kevDateAdded: '2022-04-11'
kevDueDate: '2022-05-02'
kevRansomware: true
exploited: true
ingestedAt: '2026-08-06T05:56:20.402Z'
exploits:
  github: 7
  githubRepos:
    - 'https://github.com/cube0x0/noPac'
    - 'https://github.com/ricardojba/Invoke-noPac'
    - 'https://github.com/knightswd/NoPacScan'
  checkedAt: '2026-09-27T10:33:25.879Z'
exploitAvailable: true
---

## Overview

Active Directory Domain Services Elevation of Privilege Vulnerability

## Affected

- `windows_server_2008`
- `windows_server_2008 = r2`
- `windows_server_2012`
- `windows_server_2012 = r2`
- `windows_server_2016 < 10.0.14393.4770`
- `windows_server_2016 = 2004`
- `windows_server_2019 < 10.0.17763.2300`
- `windows_server_2022 < 10.0.20348.350`

## Remediation

Upgrade past the affected range:

- `windows_server_2016 10.0.14393.4770`
- `windows_server_2019 10.0.17763.2300`
- `windows_server_2022 10.0.20348.350`