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CVE-2021-42278: Microsoft Active Directory Domain Services Privilege Escalation Vulnerability

criticalknown exploitedpublic exploitCVE-2021-42278
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Microsoft Active Directory Domain Services contains an unspecified vulnerability that allows for privilege escalation.

CSIRTS triage

vendor: Microsoftproduct: Active Directory Domain ServicesPrivilege escalation
What
An unspecified vulnerability allows for privilege escalation.
Who is affected
Users of Microsoft Active Directory Domain Services are affected.
Urgency
Immediate remediation is necessary as the vulnerability is actively exploited and critical in nature.
Action
Update to the latest version of Active Directory Domain Services.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-04-11
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-42278

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-42278coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Active Directory

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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