VulnerabilityAnalyzed
CVE-2021-36942
Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability
KEVHIGH 7.5EPSS 66.0%
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 17 November 2021). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
Windows LSA Spoofing Vulnerability
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 66.02% probability · 99th percentile
- CISA KEV
- Listed 3 November 2021 · due 17 November 2021 · used in ransomware campaigns
- Affected
- microsoft/windows server 2004 · microsoft/windows server 2008 · microsoft/windows server 2012 · microsoft/windows server 2016 · microsoft/windows server 2019 · microsoft/windows server 20h2
- Source
- secure@microsoft.com
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-36942
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36942Patch, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36942Patch, Vendor Advisory
- https://www.kb.cert.org/vuls/id/405600Exploit, Third Party Advisory, US Government Resource
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36942US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.