Junglewise Threat Intelligence

CVE-2023-21674: Microsoft Windows Advanced Local Procedure Call (ALPC) Privilege Escalation Vulnerability

CVE-2023-21674 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2023-01-10

Technologies: Microsoft Windows, Microsoft Windows Server 2012 R2, Microsoft Windows 11, Microsoft Windows Server 2022, Microsoft Windows 10, Microsoft Windows Server 2019, Microsoft Windows Server 2016, Microsoft Windows Rt 8.1. Vendors: Microsoft.

Executive brief

A use-after-free vulnerability in the Windows Advanced Local Procedure Call (ALPC) allows a local attacker to escalate privileges to SYSTEM. The vulnerability is confirmed to have been exploited in the wild.

Affected products

  • Microsoft Windows 10 1507, 1607, 1809, 20H2, 21H2, 22H2
  • Microsoft Windows 11 21H2, 22H2
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2022
  • Microsoft Windows RT 8.1

Timeline

  • 2023-01-10: disclosed
  • 2023-01-10: patched
  • 2023-01-10: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2023-01-10: exploited: Reported as exploited in the wild at time of publication.

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