CVE-2021-42278

HIGH7.5

CISA KEV

Published 2021-11-10 · Updated 2026-08-19 · Source secure@microsoft.com

Summary

CVE-2021-42278 is a high-severity (CVSS 7.5) vulnerability in Microsoft Active Directory. CISA added it to the Known Exploited Vulnerabilities catalog on April 11, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by May 2, 2022. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

All 390 known-exploited Microsoft vulnerabilities →

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:H

CISA Known-Exploited Vulnerability

Product: Microsoft — Active Directory

Name: Microsoft Active Directory Domain Services Privilege Escalation Vulnerability

Date added: 2022-04-11 · Due: 2022-05-02

USED IN RANSOMWARE

Required action: Apply updates per vendor instructions.

References

View on NVD

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