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CVE-2021-36942 (GCVE-0-2021-36942)

Vulnerability from cvelistv5 – Published: 2021-08-12 18:12 – Updated: 2026-08-10 15:10
VLAI CISA Previdian
Title
Windows LSA Spoofing Vulnerability
Summary
Windows LSA Spoofing Vulnerability
Severity
7.5 (High)
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
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-04 14:49 UTC
CWE
Assigner
References
URL Tags
https://msrc.microsoft.com/update-guide/vulnerabi… vendor-advisorypatch
https://www.kb.cert.org/vuls/id/405600 third-party-advisoryx_refsource_CERT-VNx_transferred
https://portal.msrc.microsoft.com/en-US/security-… x_refsource_MISCx_transferred
https://www.cisa.gov/known-exploited-vulnerabilit… government-resource
Impacted products
Vendor Product Version CPE status
Microsoft Windows Server 2008 R2 Service Pack 1 Affected: 6.1.7601.0 , < 6.1.7601.25685 (custom)
guessed Create a notification for this product.
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) Affected: 6.1.7601.0 , < 6.1.7601.25685 (custom)
guessed Create a notification for this product.
Microsoft Windows Server 2008 Service Pack 2 Affected: 6.0.6003.0 , < 6.0.6003.21192 (custom)
guessed Create a notification for this product.
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) Affected: 6.0.6003.0 , < 6.0.6003.21192 (custom)
guessed Create a notification for this product.
Microsoft Windows Server 2012 Affected: 6.2.9200.0 , < 6.2.9200.23435 (custom)
guessed Create a notification for this product.
Microsoft Windows Server 2012 (Server Core installation) Affected: 6.2.9200.0 , < 6.2.9200.23435 (custom)
guessed Create a notification for this product.
Microsoft Windows Server 2012 R2 Affected: 6.3.9600.0 , < 6.3.9600.20094 (custom)
guessed Create a notification for this product.
Microsoft Windows Server 2012 R2 (Server Core installation) Affected: 6.3.9600.0 , < 6.3.9600.20094 (custom)
guessed Create a notification for this product.
Microsoft Windows Server 2016 Affected: 10.0.14393.0 , < 10.0.14393.4583 (custom)
guessed Create a notification for this product.
Microsoft Windows Server 2016 (Server Core installation) Affected: 10.0.14393.0 , < 10.0.14393.4583 (custom)
guessed Create a notification for this product.
Microsoft Windows Server 2019 Affected: 10.0.17763.0 , < 10.0.17763.2114 (custom)
guessed Create a notification for this product.
Microsoft Windows Server 2019 (Server Core installation) Affected: 10.0.17763.0 , < 10.0.17763.2114 (custom)
guessed Create a notification for this product.
Microsoft Windows Server version 2004 Affected: 10.0.0 , < 10.0.19041.1165 (custom)
guessed Create a notification for this product.
Microsoft Windows Server version 20H2 Affected: 10.0.0 , < 10.0.19042.1165 (custom)
guessed Create a notification for this product.
Date Public
2021-08-10 14:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: e1463297-cf69-468a-abd8-12b943e2e53e

Vulnerability ID: CVE-2021-36942

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability | Affected: Microsoft / Windows | Description: 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. | Required action: Apply updates per vendor instructions. | Due date: 2021-11-17 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-36942
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-749
Feed CISA Known Exploited Vulnerabilities Catalog
Product Windows
Due Date 2021-11-17
Date Added 2021-11-03
Vendorproject Microsoft
Vulnerabilityname Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 12:28 UTC | Updated: 2026-02-06 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 5537edc6-2239-4616-89e6-efbd9a3085e7

Vulnerability ID: CVE-2021-36942

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEVIntel entry: Windows LSA Spoofing Vulnerability | Affected: Microsoft / Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server version 2004, Windows Server version 20H2, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) | CVSS: 7.5 (HIGH) | Used in malware: yes | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Confirmed Compromise

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Windows LSA Spoofing Vulnerability
Vendor Microsoft
Product Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server version 2004, Windows Server version 20H2, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)
Added Date 2021-11-03T00:00:00.000Z
Cvss Score 7.5
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware yes
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:04 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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      "current_release_date": "2026-03-27T13:47:53+00:00",
      "cve": "CVE-2021-36942",
      "id": "CVE-2021-36942",
      "initial_release_date": "2021-08-10T07:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Windows LSA Spoofing Vulnerability",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-36942.json",
      "version": "3"
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      "dataType": "CVE_RECORD",
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    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.