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Fencer Intel
high 7.5

CVE-2021-36942 kev+ ransomware in the critical feed json

Windows LSA Spoofing Vulnerability

published 5y ago modified 2mo 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

Is CVE-2021-36942 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Timeline

  1. Published
  2. Added to CISA KEV
  3. CISA patch deadline
  4. CISA SSVC: exploitation active

Known exploited

Added
5y ago
Patch by
2021-11-17 (4y 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
last yr.

Exploit prediction

66.02% chance of exploitation in the next 30 days, higher than 99.2% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

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

Sources

Fencer Intel 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.