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

criticalknown exploitedpublic exploitCVE-2021-36942
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Microsoft Windows Local Security Authority (LSA) contains a spoofing vulnerability allowing an unauthenticated attacker to call a method on the LSARPC interface and coerce the domain controller to authenticate against another server using NTLM.

CSIRTS triage

vendor: Microsoftproduct: WindowsAuthentication bypass
What
Microsoft Windows Local Security Authority (LSA) contains a spoofing vulnerability allowing an unauthenticated attacker to coerce authentication.
Who is affected
Deployments of Microsoft Windows with LSA.
Urgency
Remediation is critical due to active exploitation and high severity.
Action
Install the latest security updates from Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-36942

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-36942coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Windows Local

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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