CVE-2020-1284: Microsoft Windows 10

Medium severity, CVSS 6.5. EPSS: 6.9% chance of exploitation in the next 30 days.

A denial of service vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests, aka 'Windows SMBv3 Client/Server Denial of Service Vulnerability'.

Affected products

• Microsoft Windows 10: version 2004 only
• Microsoft Windows Server 2016: version 2004 only

Published 2020-06-09. Last modified 2026-06-17.