CVE-2021-42287 HIGH

CVE-2021-42287: Active Directory Domain Services Elevation of Privilege Vulnerability

Vendor Microsoft
Product Windows Server 2019
KEV Status Known Exploited
Ransomware Used in campaigns
Published November 10, 2021
Last update January 12, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

What the vulnerability does

01Description

Active Directory Domain Services Elevation of Privilege Vulnerability

CISA mandated remediation

02CISA Required Action

Apply updates per vendor instructions.

Key dates

03Disclosure timeline

November 10, 2021 CVE published
January 12, 2026 Record updated