CVE-2021-42287

CVE Enrichment

CVSS: 7.5 HIGH
EPSS: 77.17%
EPSS Percentile: 99.55%
CISA KEV: YES — Known Exploited Vulnerability

Description

Active Directory Domain Services Elevation of Privilege Vulnerability

Technical Details

CVSS Version: 3.1
CNA / NVD Source: secure@microsoft.com
Published: 10-Nov-2021 08:19
Last Modified: 20-Aug-2026 02:23
EPSS Date: 2026-10-20

CVSS Vector


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

CISA KEV Details

Date Added: 2022-04-11
Remediation Due: 2022-05-02
Known Ransomware Campaign Use: Known
Required Action: Apply updates per vendor instructions.
Notes: https://nvd.nist.gov/vuln/detail/CVE-2021-42287

Affected Products / Versions

microsoft / windows_server_2004
Version / affected range: * · before (exclusive) 10.0.19041.1348
cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:*
microsoft / windows_server_2008
Version / affected range: -
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
microsoft / windows_server_2008
Version / affected range: r2
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
microsoft / windows_server_2012
Version / affected range: -
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
microsoft / windows_server_2012
Version / affected range: r2
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
microsoft / windows_server_2016
Version / affected range: * · before (exclusive) 10.0.14393.4770
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
microsoft / windows_server_2019
Version / affected range: * · before (exclusive) 10.0.17763.2300
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
microsoft / windows_server_2022
Version / affected range: * · before (exclusive) 10.0.20348.350
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
microsoft / windows_server_20h2
Version / affected range: * · before (exclusive) 10.0.19042.1348
cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:*

References

Last enrichment sync: 21-Oct-2026 10:58
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (2)

CVE-2021-42287 16.7% CVE-2025-31324 Kaspersky 2026 Report Highlights Exploited Applications, Trusted Access and SOC Detection Gaps
Using the “noPac” attack against environments still vulnerable to CVE-2021-42278 and CVE-2021-42287. AI Agents Used in Campaign That Compromised 395 Organizations Through PaperCut Flaws

CVE (14)

Malware (10)

MITRE ATT&CK (18)

Vendors (8)

Products (14)

Tools (16)

Industries (10)

Countries (13)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.