CVE-2021-36942 kev+ ransomware in the critical feed json
Windows LSA Spoofing Vulnerability
published 2021-08-12 5 y ago modified 2026-08-10 2 mo ago also EUVD-2021-23518
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Exploited
- added 2021-11-03, used in ransomware
- epss
- 66.0%
- EPSS 66.0% chance of exploitation in 30 days, percentile 99.2%
- public exploits
- 1
- Metasploit
Summary
Windows LSA Spoofing Vulnerability
Patch / fix
cisa required action Apply updates per vendor instructions.
- Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.25685
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.25685
- Microsoft Windows Server 2008 Service Pack 2 6.0.6003.21192
- Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.21192
- Microsoft Windows Server 2012 6.2.9200.23435
- Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.23435
- Microsoft Windows Server 2012 R2 6.3.9600.20094
- Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.20094
- Microsoft Windows Server 2016 10.0.14393.4583
- Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.4583
- Microsoft Windows Server 2019 10.0.17763.2114
- Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.2114
- Microsoft Windows Server version 2004 10.0.19041.1165
- Microsoft Windows Server version 20H2 10.0.19042.1165
Timeline
- Published
- Added to CISA KEV
- CISA patch deadline
- CISA SSVC: exploitation active
Known exploited
- Added
- 5 y ago
- Patch by
- 2021-11-17 (4 y ago)
- Ransomware
- Known to be used in ransomware campaigns
- Required action
- Apply updates per vendor instructions.
- Vendor, product
- Microsoft, Windows
- CISA name
- Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability
Ransomware
Groups reported to have exploited it in intrusions.
- LockFile ransomware gang
- TheGentlemen ransomware gang
reported by security.comkelacyber.com
Ransomware Vulnerability Matrix by BushidoUK (github.com/BushidoUK/Ransomware-Vulnerability-Matrix), reformatted per CVE. CC BY 4.0
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- yes
- Technical impact
- total
- Assessed
- 21 mo ago
Exploit prediction
66.02% chance of exploitation in the next 30 days, higher than 99.2% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Metasploit auxiliary/scanner/dcerpc/petitpotam PetitPotam metasploit auxiliary, normal rank
- kb.cert.org https://www.kb.cert.org/vuls/id/405600 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | 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 |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
Affected products
- Microsoft Windows Server 2008 R2 Service Pack 1
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)
- Microsoft Windows Server 2008 Service Pack 2
- Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)
- Microsoft Windows Server 2012
- Microsoft Windows Server 2012 (Server Core installation)
- Microsoft Windows Server 2012 R2
- Microsoft Windows Server 2012 R2 (Server Core installation)
- Microsoft Windows Server 2016
- Microsoft Windows Server 2016 (Server Core installation)
- Microsoft Windows Server 2019
- Microsoft Windows Server 2019 (Server Core installation)
- Microsoft Windows Server version 2004
- Microsoft Windows Server version 20H2
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2021-36942
vendor-advisory, patch
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-36942
patch, vendor-advisory
-
kb.cert.org
/vuls/id/405600
third-party-advisory, exploit, us-government-resource
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36942
government-resource, us-government-resource
Sources
- CVE List CVE-2021-36942
- NVD CVE-2021-36942
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.