Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability (CVE-2021-36942)
Severity: high · Patch status: patched · Since 2021-11-03 · CVE-2021-36942
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. CISA added CVE-2021-36942 to its Known Exploited Vulnerabilities catalog on Nov 3, 2021, which means attackers are exploiting it in the wild. CISA reports known use in ransomware campaigns.
What to do
- Apply updates per vendor instructions.
- US federal agencies must remediate by Nov 17, 2021 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
