November 3, 2021 · Applied Cybernetics Group
CVE-2021-36942 — Microsoft Windows
known ransomware use
Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability
- Added to KEV
2021-11-03- Federal due date
2021-11-17- Vendor
- Microsoft
- Product
- Windows
- EPSS
- 99.2th percentile (score 0.660, as of
2026-09-16) - NVD CVSS v3.1
- 7.5 (HIGH)
- Ransomware use
- Known
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2021-36942
CISA short 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.
Required action
Apply updates per vendor instructions.
NVD description
Windows LSA Spoofing Vulnerability