CVEvulnerability
CVE-2021-36942
CISA Known Exploited Vulnerability
Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability — Microsoft Windows
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.
- Added to KEV
- 2021-11-03
- Remediation due
- 2021-11-17
- Ransomware use
- Known
- Required action
- Apply updates per vendor instructions.
- Notes
- https://nvd.nist.gov/vuln/detail/CVE-2021-36942
- Status
- Analyzed
- Published
- 2021-08-12
- Last modified
- 2026-08-10
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CVSS 2.0 ([email protected])
- 5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:P/A:N
Description
Windows LSA Spoofing Vulnerability
Affected configurations
• microsoft windows server 2004 (< 10.0.19041.1165)
• microsoft windows server 2008
• microsoft windows server 2008 r2
• microsoft windows server 2012
• microsoft windows server 2012 r2
• microsoft windows server 2016 (< 10.0.14393.4583)
• microsoft windows server 2019 (< 10.0.17763.2114)
• microsoft windows server 20h2 (< 10.0.19042.1165)
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36942 Patch, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36942 Patch, Vendor Advisory
- https://www.kb.cert.org/vuls/id/405600 Exploit, Third Party Advisory, US Government Resource
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36942 US Government Resource