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Vulnerabilities

Vulnerability · CVE-2023-21674

Microsoft Windows Advanced Local Procedure Call (ALPC) Privilege Escalation Vulnerability

Published Jan 10, 2023 · catalog updated Jun 16, 2026 · Microsoft Windows

Patch now

CVE-2023-21674 is in the CISA known-exploited catalog, due Jan 31, 2023. Confirm Microsoft Windows against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
High8.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
40.99%
Remediation
Remediation guidance
Affected products
cpe microsoft/windows 10 1507 · cpe microsoft/windows 10 1607 · cpe microsoft/windows 10 1809 · cpe microsoft/windows 10 20h2 · cpe microsoft/windows 10 21h2 · cpe microsoft/windows 10 22h2

Microsoft Windows Advanced Local Procedure Call (ALPC) contains an unspecified vulnerability that allows for privilege escalation.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/windows 10 1507version unspecified
  • cpe microsoft/windows 10 1607version unspecified
  • cpe microsoft/windows 10 1809version unspecified
  • cpe microsoft/windows 10 20h2version unspecified
  • cpe microsoft/windows 10 21h2version unspecified
  • cpe microsoft/windows 10 22h2version unspecified
  • cpe microsoft/windows 11 21h2version unspecified
  • cpe microsoft/windows 11 22h2version unspecified
  • vendor Microsoft Windowsversion unspecified

How to fix CVE-2023-21674

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2023-21674 is in the CISA known-exploited catalog, due Jan 31, 2023. Confirm Microsoft Windows against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply updates per vendor instructions.

What should an analyst verify?

CWE-416: Use After Free. EPSS 40.99%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 10, 2023 · Catalog

    Detected

    Microsoft Windows Advanced Local Procedure Call (ALPC) contains an unspecified vulnerability that allows for privilege escalation.

  2. Jan 10, 2023 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Jan 31, 2023 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    Microsoft Windows Advanced Local Procedure Call (ALPC) contains an unspecified vulnerability that allows for privilege escalation.

Sources

  • CISA KEVConfirmed exploitationCVE-2023-21674

    Microsoft Windows Advanced Local Procedure Call (ALPC) contains an unspecified vulnerability that allows for privilege escalation.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2023-21674

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2023-21674

    30-day exploitation probability 41.0%

    first.org
  • NIST NVDVulnerability recordCVE-2023-21674

    Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2023-21674

    Microsoft Windows Advanced Local Procedure Call (ALPC) contains an unspecified vulnerability that allows for privilege escalation.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.