SARA / Free Tools / KEV / CVE-2021-36942

CVE-2021-36942 on CISA KEV

Windows LSA Spoofing Vulnerability

CISA KEV — Actively Exploited

Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability

Vendor / Product
— / Microsoft / Windows
Added to KEV
2021-11-03
BOD 22-01 due
2021-11-17
Ransomware use
Known
CVSS / EPSS
7.5 HIGH · EPSS 93.55%

01What CISA says about this vulnerability

Windows LSA Spoofing Vulnerability

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

VendorProductVersions
MicrosoftWindows Server 201910.0.0
MicrosoftWindows Server 2019 (Server Core installation)10.0.0
MicrosoftWindows Server version 200410.0.0
MicrosoftWindows Server version 20H210.0.0
MicrosoftWindows Server 201610.0.0
MicrosoftWindows Server 2016 (Server Core installation)10.0.0
MicrosoftWindows Server 2008 Service Pack 26.0.0
MicrosoftWindows Server 2008 Service Pack 2 (Server Core installation)6.0.0
MicrosoftWindows Server 2008 Service Pack 26.0.0
MicrosoftWindows Server 2008 R2 Service Pack 16.1.0
MicrosoftWindows Server 2008 R2 Service Pack 1 (Server Core installation)6.0.0
MicrosoftWindows Server 20126.2.0
MicrosoftWindows Server 2012 (Server Core installation)6.2.0
MicrosoftWindows Server 2012 R26.3.0
MicrosoftWindows Server 2012 R2 (Server Core installation)6.3.0

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

Open in Sigma generator →

Programmatic KEV data?
SARA's API returns KEV, CVSS, EPSS + analyst summary in one call.
Read the API reference →
Full CVE detail → Search KEV →