CVE-2023-21674 (GCVE-0-2023-21674)

Vulnerability from cvelistv5 – Published: 2023-01-10 00:00 – Updated: 2025-10-21 23:15
VLAI CISA KEVIntel
Title
Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability
Summary
Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Microsoft Windows 10 Version 1809 Affected: 10.0.17763.0 , < 10.0.17763.3887 (custom)
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Microsoft Windows 10 Version 1809 Affected: 10.0.0 , < 10.0.17763.3887 (custom)
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Microsoft Windows Server 2019 Affected: 10.0.17763.0 , < 10.0.17763.3887 (custom)
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Microsoft Windows Server 2019 (Server Core installation) Affected: 10.0.17763.0 , < 10.0.17763.3887 (custom)
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Microsoft Windows Server 2022 Affected: 10.0.20348.0 , < 10.0.20348.1487 (custom)
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Microsoft Windows 10 Version 20H2 Affected: 10.0.0 , < 10.0.19042.2486 (custom)
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Microsoft Windows 11 version 21H2 Affected: 10.0.0 , < 10.0.22000.1455 (custom)
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Microsoft Windows 10 Version 21H2 Affected: 10.0.19043.0 , < 10.0.19044.2486 (custom)
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Microsoft Windows 11 version 22H2 Affected: 10.0.22621.0 , < 10.0.22621.1105 (custom)
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Microsoft Windows 10 Version 22H2 Affected: 10.0.19045.0 , < 10.0.19045.2486 (custom)
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Microsoft Windows 10 Version 1507 Affected: 10.0.10240.0 , < 10.0.10240.19685 (custom)
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Microsoft Windows 10 Version 1607 Affected: 10.0.14393.0 , < 10.0.14393.5648 (custom)
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Microsoft Windows Server 2016 Affected: 10.0.14393.0 , < 10.0.14393.5648 (custom)
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Microsoft Windows Server 2016 (Server Core installation) Affected: 10.0.14393.0 , < 10.0.14393.5648 (custom)
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Microsoft Windows 8.1 Affected: 6.3.0 , < 6.3.9600.20778 (custom)
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Microsoft Windows Server 2012 R2 Affected: 6.3.9600.0 , < 6.3.9600.20778 (custom)
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Microsoft Windows Server 2012 R2 (Server Core installation) Affected: 6.3.9600.0 , < 6.3.9600.20778 (custom)
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Date Public
2023-01-10 08:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2023-21674

Status: Confirmed

Status Updated: 2023-01-10 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2023-01-10
Asserted: 2023-01-10

Scope
Notes: KEV entry: Microsoft Windows Advanced Local Procedure Call (ALPC) Privilege Escalation Vulnerability | Affected: Microsoft / Windows | Description: Microsoft Windows Advanced Local Procedure Call (ALPC) contains an unspecified vulnerability that allows for privilege escalation. | Required action: Apply updates per vendor instructions. | Due date: 2023-01-31 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-21674; https://nvd.nist.gov/vuln/detail/CVE-2023-21674

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev


Details
Cwes CWE-416
Feed CISA Known Exploited Vulnerabilities Catalog
Product Windows
Due Date 2023-01-31
Date Added 2023-01-10
Vendorproject Microsoft
Vulnerabilityname Microsoft Windows Advanced Local Procedure Call (ALPC) Privilege Escalation Vulnerability
Knownransomwarecampaignuse Unknown

References

Created: 2026-02-02 12:27 UTC | Updated: 2026-02-06 07:17 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2023-21674

Status: Confirmed

Status Updated: 2023-01-10 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2023-01-10
Asserted: 2023-01-10

Scope
Notes: KEVIntel entry: Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability | Affected: Microsoft / Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows 10 Version 20H2, Windows 11 version 21H2, Windows 10 Version 21H2, Windows 11 version 22H2, Windows 10 Version 22H2, Windows 10 Version 1507, Windows 10 Version 1607, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows 8.1, Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) | CVSS: 8.8 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel


Details
Feed KEVIntel (kevintel.com)
Title Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability
Vendor Microsoft
Product Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows 10 Version 20H2, Windows 11 version 21H2, Windows 10 Version 21H2, Windows 11 version 22H2, Windows 10 Version 22H2, Windows 10 Version 1507, Windows 10 Version 1607, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows 8.1, Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)
Added Date 2023-01-10T00:00:00.000Z
Cvss Score 8.8
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False

References

Created: 2026-06-23 14:05 UTC | Updated: 2026-06-23 14:05 UTC
Show details on NVD website

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      "cveMetadata": "{\"cveId\": \"CVE-2023-21674\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-21T23:15:28.774Z\", \"dateReserved\": \"2022-12-13T00:00:00.000Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2023-01-10T00:00:00.000Z\", \"assignerShortName\": \"microsoft\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.

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Detection rules are retrieved from Rulezet.

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