CVE-2021-36942: Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability

CVE-2021-36942 · Severity: critical · CVSS 7.5 · Exploited in the wild · Published 2021-11-03

A spoofing vulnerability in the Microsoft Windows Local Security Authority (LSA) allows an unauthenticated attacker to call a method on the LSARPC interface. This can be used to coerce a domain controller to authenticate against a remote server using NTLM, facilitating further attacks.

Technologies: Microsoft Windows. Vendors: Microsoft.

Quick answers

Is CVE-2021-36942 exploited in the wild?
Yes. CVE-2021-36942 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2021-36942?
Critical severity, with a CVSS score of 7.5, published 3 November 2021.
Which products and versions are affected?
Microsoft Windows Server 2008 Service Pack 2; Microsoft Windows Server 2008 R2 Service Pack 1; Microsoft Windows Server 2012; Microsoft Windows Server 2012 R2; and 4 more.
Is there a fix for CVE-2021-36942?
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-2021-36942 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2021-36942?
Check whether you run Microsoft Windows. 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
  • Microsoft Windows Server 2008 R2 Service Pack 1
  • Microsoft Windows Server 2012
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2016 up to (excluding) 10.0.14393.4583
  • Microsoft Windows Server 2019 up to (excluding) 10.0.17763.2114
  • Microsoft Windows Server 2004 up to (excluding) 10.0.19041.1165
  • Microsoft Windows Server 20H2 up to (excluding) 10.0.19042.1165

Timeline

  • 2021-08-12: disclosed: NVD Published Date
  • 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2021-11-03: advisory: Advisory published date provided in report
  • 2021-11-17: other: CISA Due Date for remediation

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