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CVE-2021-42278: Microsoft Active Directory Domain Services Privilege Escalation Vulnerability
Microsoft Active Directory · in CISA KEV since 2022-04-11
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2022-04-11added to KEV
2022-05-02federal remediation due date
73.30%EPSS exploit probability (30 days) 99.4th percentile
7.5 HIGHCVSS 3.1
Knownknown ransomware use
152days from NVD publication to KEV
What it is
Microsoft Active Directory Domain Services contains an unspecified vulnerability that allows for privilege escalation.
Required action (CISA)
Apply updates per vendor instructions.
| CWE | CWE-20 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD published | 2021-11-10 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2021-42278.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.
Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.