The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.
mpengine.dll in Microsoft Malware Protection Engine before 1.1.9506.0 on x64 platforms allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted file.
cpe:2.3:a:microsoft:malware_protection_engine:*:-:*:*:*:*:x64:* versions up to 1.1.9402.0 (inclusive)