⚠ Actively exploited in ransomware campaigns
This vulnerability is on the CISA Known Exploited Vulnerabilities list and has been used in known ransomware attacks. CISA required action: Apply updates per vendor instructions.. Due date: 2022-05-02.

CVE-2021-42278

CWE-20 — Improper Input ValidationCWE-269 — Improper Privilege Management8 documents8 sources
Severity
7.5HIGH
EPSS
94.1%
top 0.10%
CISA KEV
KEVRansomware
Added 2022-04-11
Due 2022-05-02
Exploit
Exploited in wild
Active exploitation observed
Affected products
18
Microsoft Windows Server 2008 R2 Service Pack 1Microsoft Windows Server 2008 R2 Service Pack 1 (server Core Installation)Microsoft Windows Server 2008 Service Pack 2+15 more
Timeline
PublishedNov 10
KEV addedApr 11
KEV dueMay 2
Latest updateMay 24
CISA Required Action: Apply updates per vendor instructions.

Description

Active Directory Domain Services Elevation of Privilege Vulnerability

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.6 | Impact: 5.9

Affected Packages16 packages

▶NVDmicrosoft/windows< 10.0.19041.1348+5
▶CVEListV5microsoft/windows_server_20126.2.0 — 6.2.9200.23517
▶CVEListV5microsoft/windows_server_201610.0.0 — 10.0.14393.4770
▶CVEListV5microsoft/windows_server_201910.0.0 — 10.0.17763.2300
▶CVEListV5microsoft/windows_server_202210.0.0 — 10.0.20348.350

Patches

Patch: portal.msrc.microsoft.com ↗Patch: portal.msrc.microsoft.com ↗

🔴Vulnerability Details

3
GHSA
GHSA-chp6-c7f5-h9w9: Active Directory Domain Services Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-42282, CVE-2021-42287, CVE-2021-42291↗2022-05-24
▶
CVEList
Active Directory Domain Services Elevation of Privilege Vulnerability↗2021-11-10
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VulnCheck
Microsoft Active Directory Domain Services Privilege Escalation Vulnerability↗2021
▶

🔍Detection Rules

1
Elastic
Potential Privileged Escalation via SamAccountName Spoofing↗
▶

📋Vendor Advisories

2
CISA
Microsoft Active Directory Domain Services Privilege Escalation Vulnerability↗2022-04-11
▶
Microsoft
Active Directory Domain Services Elevation of Privilege Vulnerability↗2021-11-09
▶

🕵️Threat Intelligence

1
Fortinet
From User to Domain Admin in (less than) 60 seconds: CVE-2021-42278/CVE-2021-42287 | FortiGuard Labs↗2022-01-05
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CVE-2021-42278 (HIGH CVSS 7.5) | Active Directory Domain Services El | cvebase.io