CVE-2015-2361: Microsoft Windows 8.1

High severity, CVSS 7.2. EPSS: 1.9% chance of exploitation in the next 30 days.

Hyper-V in Microsoft Windows 8.1 and Windows Server 2012 R2 does not properly initialize guest OS system data structures, which allows guest OS users to execute arbitrary code on the host OS or cause a denial of service (buffer overflow) by leveraging guest OS privileges, aka "Hyper-V Buffer Overflow Vulnerability."

Affected products

• Microsoft Windows 8.1: affected versions not specified
• Microsoft Windows Server 2012: version r2 only

Published 2015-07-14. Last modified 2026-06-17.