Microsoft Office
CVE-2020-1583 — Microsoft Word Information Disclosure Vulnerability
Executive Summary
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.
Overview
8.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
EPSS Score
0.04906
probability of exploitation in the next 30 days
0.90975 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
20 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft 365 Apps for Enterprise for 32-bit Systems | Click to Run (Security Update) |
Important | Information Disclosure | No |
| Microsoft 365 Apps for Enterprise for 64-bit Systems | Click to Run (Security Update) |
Important | Information Disclosure | No |
| Microsoft Office 2010 Service Pack 2 (32-bit editions) | 4484492 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Office 2010 Service Pack 2 (64-bit editions) | 4484492 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Office 2016 for Mac | Release Notes (Security Update) |
Important | Information Disclosure | No |
| Microsoft Office 2019 for 32-bit editions | Click to Run (Security Update) |
Important | Information Disclosure | No |
| Microsoft Office 2019 for 64-bit editions | Click to Run (Security Update) |
Important | Information Disclosure | No |
| Microsoft Office 2019 for Mac | Release Notes (Security Update) |
Important | Information Disclosure | No |
| Microsoft Office Online Server | 4484470 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Office Web Apps 2010 Service Pack 2 | 4484495 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Office Web Apps 2013 Service Pack 1 | 4484481 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft SharePoint Enterprise Server 2013 Service Pack 1 | 4484478 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft SharePoint Enterprise Server 2016 4484473 (Security Update) 4484476 (Security Update) Important Information Disclosure 4484436 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft SharePoint Server 2010 Service Pack 2 | 4484490 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft SharePoint Server 2019 4484472 (Security Update) 4484471 (Security Update) Important Information Disclosure 4484453 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft Word 2010 Service Pack 2 (32-bit editions) | 4484494 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Word 2010 Service Pack 2 (64-bit editions) | 4484494 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Word 2013 RT Service Pack 1 | 4484484 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Word 2013 Service Pack 1 (32-bit editions) | 4484484 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Word 2013 Service Pack 1 (64-bit editions) | 4484484 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Word 2016 (32-bit edition) | 4484474 (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Word 2016 (64-bit edition) | 4484474 (Security Update) |
Important | Information Disclosure | Maybe |
Patches
11 patches
| Article | Type | Restart |
|---|---|---|
Click to Run |
Security Update | No |
4484492 |
Security Update | Maybe |
Release Notes |
Security Update | No |
4484470 |
Security Update | Maybe |
4484495 |
Security Update | Maybe |
4484481 |
Security Update | Maybe |
4484478 |
Security Update | Maybe |
4484490 |
Security Update | Maybe |
4484494 |
Security Update | Maybe |
4484484 |
Security Update | Maybe |
4484474 |
Security Update | Maybe |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Haifei Li of McAfee IPS Security Research Team
References
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