CVE DATABASE / CVE-2021-42287
CVE-2021-42287
Microsoft Active Directory Domain Services Privilege Escalation Vulnerability
CVSS 7.5 · HIGH
⚠ CISA KEV — ACTIVELY EXPLOITED
RANSOMWARE
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2022-04-11.
Federal remediation due 2022-05-02.
Required action: Apply updates per vendor instructions.
Summary
Active Directory Domain Services Elevation of Privilege Vulnerability
CVSS 3.1 breakdown
| Base score | 7.5 (HIGH) |
| Vector | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| Attack vector | NETWORK |
| Attack complexity | HIGH |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity | HIGH |
| Availability | HIGH |
Affected products
Microsoft windows server 2008Microsoft windows server 2012Microsoft windows server 2016Microsoft windows server 2019Microsoft windows server 2022
Check this CVE live
Use our free CVE Lookup tool for the latest NVD record, or browse the full CISA KEV catalog.
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42287
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42287
Data: NIST NVD + CISA KEV. NVD last modified 2025-10-30. Always verify against the vendor advisory before acting.