HIGHCVSS 7.5Actively exploited · CISA KEV since 2022-04-11Vulnerability

CVE-2021-42278

Microsoft Active Directory Domain Services contains an unspecified vulnerability that allows for privilege escalation.

Properties

Euvd product
Windows Server 2012, Windows Server 2008 R2 Service Pack 1, Windows Server version 2004, Windows Server 2016, Windows Server 2019 (Server Core installation), Windows Server 2012 (Server Core installation), Windows Server 2012 R2 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2012 R2, Windows Server 2022, Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server version 20H2
Vulnerability name
Microsoft Active Directory Domain Services Privilege Escalation Vulnerability
First seen
2026-08-19T16:27:25+00:00
Cvss score
7.5
Epss score
0.73297
Last seen
2026-10-19T12:00:27+00:00
Due date
2022-05-02
Euvd assigner
microsoft
Retrieved at
2026-10-21T01:24:47+00:00
Exploited euvd since
2022-04-11T00:00:00+00:00
Src batch id
epss_history-20261020T103617Z-728ddd
Source url
https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
Date added
2022-04-11
Euvd base score version
3.1
Score
7.5
Fetched at
2026-10-20T10:36:20+00:00
Euvd vendor
Microsoft
Cvss vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
In Signal since
initial import (Sep 2026)
Euvd base score
7.5

Related Entities (12)

AFFECTS_PRODUCT (9)

→[Product]cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
→[Product]cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*

DESCRIBES (1)

←[KEVEntry]Microsoft Active Directory Domain Services Privilege Escalation Vulnerability

INVOLVES (1)

←[Signal]kev_added · 2022-04-11

MENTIONED_IN (1)

→[Campaign]Agents Gone Wild: An AI-Orchestrated Global Campaign Against PaperCut NG/MF

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CVE-2021-42278 (CVSS 7.5) — Ninja Signal Threat Intelligence | Ninja Signal