CVE-2021-42287
Published: April 11, 2022
Official Description
Microsoft Active Directory Domain Services contains an unspecified vulnerability that allows for privilege escalation.
CISA KEV Advisory
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.
Risk Analysis
An unspecified vulnerability in Microsoft Active Directory Domain Services allows for privilege escalation. The high EPSS score and confirmed exploitation in the wild indicate this is a critical security concern that requires immediate attention.
This vulnerability is actively exploited in the wild and is included in CISA's KEV catalog. It is remotely exploitable.
Ensure all Microsoft Active Directory Domain Services are fully patched with the latest security updates. Implement least privilege principles for all user accounts.
Technical Analysis
CVE-2021-42287 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2021-42287 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-42287 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1