Back to CVE records
High 7.5Known exploited (CISA KEV)Published Aug 12, 2021
CVE-2021-36942Windows LSA Spoofing Vulnerability
Updated under an hour ago ()
Does this affect you?
It affects Microsoft Windows Server 2008 R2 Service Pack 1 and 12 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Nov 3, 2021; federal agencies had to remediate by Nov 17, 2021, and it is known to be used in ransomware. Treat that date as your deadline.
Do this next
Start free and add your stack
Free account, 1 product
Windows LSA Spoofing Vulnerability
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C
- Weakness (CWE)
- Not given
- Known exploited
- Added to CISA KEV Nov 3, 2021; federal remediation due Nov 17, 2021; known ransomware useApply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 66.02% (percentile 99)
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Aug 10, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft Windows Server 2008 R2 Service Pack 1 microsoft:windows_server_2008_r2_service_pack_1 (from the name) | from 6.1.7601.0 before 6.1.7601.25685 | CNA record |
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) microsoft:windows_server_2008_r2_service_pack_1_server_core_installation (from the name) | from 6.1.7601.0 before 6.1.7601.25685 | CNA record |
Microsoft Windows Server 2008 Service Pack 2 microsoft:windows_server_2008_service_pack_2 (from the name) | from 6.0.6003.0 before 6.0.6003.21192 | CNA record |
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) microsoft:windows_server_2008_service_pack_2_server_core_installation (from the name) | from 6.0.6003.0 before 6.0.6003.21192 | CNA record |
Microsoft Windows Server 2012 microsoft:windows_server_2012 (from the name) | from 6.2.9200.0 before 6.2.9200.23435 | CNA record |
Microsoft Windows Server 2012 R2 microsoft:windows_server_2012_r2 (from the name) | from 6.3.9600.0 before 6.3.9600.20094 | CNA record |
Microsoft Windows Server 2016 microsoft:windows_server_2016 (from the name) | from 10.0.14393.0 before 10.0.14393.4583 | CNA record |
Microsoft Windows Server 2019 microsoft:windows_server_2019 (from the name) | from 10.0.17763.0 before 10.0.17763.2114 | CNA record |
Microsoft Windows Server version 2004 microsoft:windows_server_version_2004 (from the name) | from 10.0.0 before 10.0.19041.1165 | CNA record |
Microsoft Windows Server version 20H2 microsoft:windows_server_version_20h2 (from the name) | from 10.0.0 before 10.0.19042.1165 | CNA record |
microsoft windows_server_2004 microsoft:windows_server_2004 | before 10.0.19041.1165 | NVD |
microsoft windows_server_2008 microsoft:windows_server_2008 | all versions; r2 | NVD |
microsoft windows_server_2012 microsoft:windows_server_2012 | all versions; r2 | NVD |
microsoft windows_server_2016 microsoft:windows_server_2016 | before 10.0.14393.4583 | NVD |
microsoft windows_server_2019 microsoft:windows_server_2019 | before 10.0.17763.2114 | NVD |
microsoft windows_server_20h2 microsoft:windows_server_20h2 | before 10.0.19042.1165 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36942vendor-advisory, patch
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.