Is CVE-2021-36942 actively exploited?

Yes. CVE-2021-36942 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-36942 be exploited remotely?

The attack vector of CVE-2021-36942 has not been classified yet.

What is the CVSS score of CVE-2021-36942?

CVE-2021-36942 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-36942

HIGHCISA KEVIN THE WILD

CVE-2021-36942

Published: November 3, 2021

EPSS:93.55%probability of exploitation in 30 daysPercentile:99.8th

Official Description

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.

NVD Source

CISA KEV Advisory

Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability

Added to KEV: 2021-11-03Federal patch deadline: 2021-11-17⚠ USED IN RANSOMWARE CAMPAIGNS

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

This Microsoft Windows Local Security Authority (LSA) spoofing vulnerability allows an unauthenticated attacker to coerce a domain controller into authenticating against another server using NTLM. Its high EPSS score of 0.93551 and inclusion in CISA's KEV indicate a very high likelihood of active exploitation and significant risk.

Active exploitation of this vulnerability has been observed in the wild. The flaw is remotely exploitable by an unauthenticated attacker.

Recommended Action

Apply the latest security updates for Microsoft Windows. Implement NTLM relay protections and consider disabling NTLM where possible.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-36942 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-2021-36942 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.