Is CVE-2021-42278 actively exploited?

CVE-2021-42278 has no public evidence of in-the-wild exploitation as of 2025-10-30.

What is the CVSS score for CVE-2021-42278?

CVE-2021-42278 has a CVSS score of 7.5 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2021-42278?

Patch guidance is available from microsoft security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-42278.

Fix CVE-2021-42278 - HIGH microsoft windows server 2004

Q: Which products are affected by CVE-2021-42278?

9 products: microsoft windows server 2004, microsoft windows server 2008, microsoft windows server 2008, microsoft windows server 2012, microsoft windows server 2012, and 4 more.

Description

Active Directory Domain Services Elevation of Privilege Vulnerability

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: high
Privileges: low
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: NVD-CWE-noinfo

Metadata

Primary Vendor: MICROSOFT
Published: 11/10/2021
Last Modified: 10/30/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

microsoft : windows_server_2004microsoft : windows_server_2008microsoft : windows_server_2008microsoft : windows_server_2012microsoft : windows_server_2012microsoft : windows_server_2016microsoft : windows_server_2019microsoft : windows_server_2022microsoft : windows_server_20h2

Remediation Guidance

Executive Summary

View on NIST NVD