CVE-2021-36942

HIGH7.5

CISA KEV

Published 2021-08-12 · Updated 2026-08-10 · Source secure@microsoft.com

Summary

CVE-2021-36942 is a high-severity (CVSS 7.5) vulnerability in Microsoft Windows. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by November 17, 2021. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

All 390 known-exploited Microsoft vulnerabilities →

Description

Windows LSA Spoofing Vulnerability

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA Known-Exploited Vulnerability

Product: Microsoft — Windows

Name: Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability

Date added: 2021-11-03 · Due: 2021-11-17

USED IN RANSOMWARE

Required action: Apply updates per vendor instructions.

References

View on NVD

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