CVE-2017-8558: Microsoft Endpoint Protection

High severity, CVSS 7.8. EPSS: 43.6% chance of exploitation in the next 30 days.

The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on 32-bit versions of Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703 does not properly scan a specially crafted file leading to memory corruption. aka "Microsoft Malware Protection Engine Remote Code Execution Vulnerability".

Affected products

• Microsoft Endpoint Protection: affected versions not specified
• Microsoft Forefront Endpoint Protection: affected versions not specified; version 2010 only
• Microsoft Security Essentials: affected versions not specified
• Microsoft Windows Defender: affected versions not specified
• Microsoft Windows Intune Endpoint Protection: affected versions not specified

Published 2017-06-29. Last modified 2026-06-17.