CVE-2023-21674

HIGH severity · CVSS 8.8 · Use-after-free · actively exploited (CISA KEV)

8.8CVSS HIGH ● exploited

🔴 Actively exploited in the wild (CISA Known Exploited Vulnerabilities). Added to KEV 2023-01-10. US federal agencies must patch by 2023-01-31.

Summary

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

Impact & exploitability

Attack vectorLocal

Attack complexityLow

Privileges requiredLow

User interactionNone

Confidentiality impactHigh

Integrity impactHigh

Availability impactHigh

Exploit probability (EPSS)20%

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products we track (1)

Windows Server 2022

Recommendation

This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.

Official patch: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21674 ↗

Additional information

NVD record
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21674Patch
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21674Patch
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-21674