CVE-2020-1342 — Microsoft Office Information Disclosure Vulnerability

Executive Summary

An information disclosure vulnerability exists when Microsoft Office software reads out of bound memory due to an uninitialized variable, which could disclose the contents of memory. An attacker who successfully exploited the vulnerability could view out of bound memory. Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office software. The security update addresses the vulnerability by properly initializing the affected variable.

Overview

5.5

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Information Disclosure

Released Jul 14 2020

Last Updated Jul 14 2020

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.06411 — 0.92803 percentile

NVD CVSS 5.5 MEDIUM — differs from MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

Required

SCOPE

Unchanged

EPSS Score

0.06411

probability of exploitation in the next 30 days

0.92803 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)	`4484456 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office 2010 Service Pack 2 (64-bit editions)	`4484456 (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	`4484451 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office Web Apps 2010 Service Pack 2	`4484381 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office Web Apps 2013 Service Pack 1	`4484357 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft SharePoint Enterprise Server 2013 Service Pack 1	`4484348 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft SharePoint Enterprise Server 2016 4484436 (Security Update) 4484440 (Security Update) Important Information Disclosure 4484402 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft SharePoint Server 2010 Service Pack 2	`4484370 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft SharePoint Server 2019 4484453 (Security Update) 4484452 (Security Update) Important Information Disclosure 4484400 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft Word 2010 Service Pack 2 (32-bit editions)	`4484458 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Word 2010 Service Pack 2 (64-bit editions)	`4484458 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Word 2013 RT Service Pack 1	`4484446 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Word 2013 Service Pack 1 (32-bit editions)	`4484446 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Word 2013 Service Pack 1 (64-bit editions)	`4484446 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Word 2016 (32-bit edition)	`4484438 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Word 2016 (64-bit edition)	`4484438 (Security Update)`	Important	Information Disclosure	Maybe

Patches

11 patches

Article	Type	Restart
`Click to Run`	Security Update	No
`4484456`	Security Update	Maybe
`Release Notes`	Security Update	No
`4484451`	Security Update	Maybe
`4484381`	Security Update	Maybe
`4484357`	Security Update	Maybe
`4484348`	Security Update	Maybe
`4484370`	Security Update	Maybe
`4484458`	Security Update	Maybe
`4484446`	Security Update	Maybe
`4484438`	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, @olekmirosh

References

MSRC Advisory MITRE NVD