Is CVE-2021-42278 in the CISA KEV catalog?

Yes. CVE-2021-42278 is on the CISA Known Exploited Vulnerabilities list, added 2022-04-11, and has known ransomware campaign use.

What is the CVSS severity of CVE-2021-42278?

CVE-2021-42278 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-42278?

CVE-2021-42278 has an EPSS score of 70.21% (99th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2021-42278

HIGHCISA KEVEPSS 99th pctl

7.5

CVSS v3

NVD

Description

Active Directory Domain Services Elevation of Privilege Vulnerability

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

70.21%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft Active Directory Domain Services Privilege Escalation Vulnerability

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

Apply updates per vendor instructions.

Remediation due: 2022-05-02

Associated with ransomware campaigns

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-30.