CVE-2020-1583: Microsoft 365 Apps

High severity, CVSS 8.8. EPSS: 4.9% chance of exploitation in the next 30 days.

An information disclosure vulnerability exists when Microsoft Word improperly discloses the contents of its memory. An attacker who exploited the vulnerability could use the information to compromise the user’s computer or data. To exploit the vulnerability, an attacker could craft a special document file and then convince the user to open it. An attacker must know the memory address location where the object was created. The update addresses the vulnerability by changing the way certain Word functions handle objects in memory.

Affected products

• Microsoft 365 Apps: affected versions not specified
• Microsoft Office: version 2010 only; version 2016 only; version 2019 only
• Microsoft Office Online Server: affected versions not specified
• Microsoft Office Web Apps: version 2010 only; version 2013 only
• Microsoft SharePoint Enterprise Server: version 2013 only; version 2016 only
• Microsoft SharePoint Server: version 2010 only; version 2019 only
• Microsoft Word: version 2010 only; version 2013 only; version 2016 only

Published 2020-08-17. Last modified 2026-06-17.