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
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.
Yes. CVE-2023-21674 is known to be exploited in the wild, first recorded on 10 January 2023. Treat it as urgent.
How severe is CVE-2023-21674?
Critical severity, with a CVSS score of 8.8, published 10 January 2023.
Which products and versions are affected?
Microsoft Windows 10 1507, 1607, 1809, 20H2, 21H2, 22H2; Microsoft Windows 11 21H2, 22H2; Microsoft Windows Server 2012 R2; Microsoft Windows Server 2016; and 3 more.
Is there a fix for CVE-2023-21674?
A patch was published on 2023-01-10. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2023-21674 attacked?
It is attacked with local access, in an operating system.
Am I affected by CVE-2023-21674?
Check whether you run Microsoft Windows. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
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.