CVE-2021-42287: Microsoft Active Directory Domain Services Privilege Escalation Vulnerability

CVE-2021-42287 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2022-04-11

Microsoft Active Directory Domain Services contains an elevation of privilege vulnerability that allows an authenticated attacker to escalate their privileges. The flaw is related to how the service handles authentication requests, potentially allowing a regular user to gain domain administrator rights. This vulnerability has been observed being exploited in the wild.

Technologies: Microsoft Active Directory. Vendors: Microsoft.

Quick answers

Is CVE-2021-42287 exploited in the wild?
Yes. CVE-2021-42287 is known to be exploited in the wild, first recorded on 11 April 2022. Treat it as urgent.
How severe is CVE-2021-42287?
Critical severity, with a CVSS score of 8.8, published 11 April 2022.
Which products and versions are affected?
Microsoft Windows Server 2008 Service Pack 2, R2 Service Pack 1; Microsoft Windows Server 2012 R2; Microsoft Windows Server 2016 up to (excluding) 10.0.14393.4770, version 2004; Microsoft Windows Server 2019 up to (excluding) 10.0.17763.2300; and 1 more.
Is there a fix for CVE-2021-42287?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2021-42287 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2021-42287?
Check whether you run Microsoft Active Directory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Microsoft Windows Server 2008 Service Pack 2, R2 Service Pack 1
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2016 up to (excluding) 10.0.14393.4770, version 2004
  • Microsoft Windows Server 2019 up to (excluding) 10.0.17763.2300
  • Microsoft Windows Server 2022 up to (excluding) 10.0.20348.350

Timeline

  • 2021-11-09: disclosed: NVD Published Date
  • 2022-04-11: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2022-05-02: other: CISA Due Date for remediation

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