HIGH CISA KEV
CVE-2021-42287
CVSS v3
7.5
HIGH
EPSS Score
77.2 %
exploit probability, as of 2026-10-19
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
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Affected and fixed versions
Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2021-42287 yet.
Description
Active Directory Domain Services Elevation of Privilege Vulnerability
CISA Known Exploited Vulnerability
- Date Added
- 2022-04-11
- Patch Due Date
- 2022-05-02
- Ransomware Use
- Known
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Published
- 2021-11-10
- Last Modified
- 2026-08-19
Frequently asked questions
What is CVE-2021-42287?
Active Directory Domain Services Elevation of Privilege Vulnerability
Is CVE-2021-42287 actively exploited?
Yes. CVE-2021-42287 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-05-02.
What is the CVSS score for CVE-2021-42287?
CVE-2021-42287 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C.
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