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Microsoft Office Word

CVE-2021-40486 — Microsoft Word Remote Code Execution Vulnerability

Critical CVSS 7.8 EPSS 0.05692 2021-10 archive

Executive Summary

None

Overview

7.8
CVSS HIGH
Critical
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Remote Code Execution
Released Oct 12 2021
Last Updated Oct 12 2021
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.05692 — 0.9201 percentile
NVD CVSS 7.8 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.8

EPSS Score

0.05692
probability of exploitation in the next 30 days
0.9201 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

11 affected products
Product KB Article Severity Impact Restart Required
Microsoft Office 2019 for 32-bit editions Click to Run (Security Update) Critical Remote Code Execution No
Microsoft Office 2019 for 64-bit editions Click to Run (Security Update) Critical Remote Code Execution No
Microsoft Office Online Server 5002027 (Security Update) Critical Remote Code Execution Maybe
Microsoft Office Web Apps Server 2013 Service Pack 1 5002036 (Security Update) Critical Remote Code Execution Maybe
Microsoft SharePoint Enterprise Server 2013 Service Pack 1 5001924 (Security Update) Critical Remote Code Execution Maybe
Microsoft SharePoint Enterprise Server 2016 5002029 (Security Update) 5002006 (Security Update) Critical Remote Code Execution 5002020 5001981 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 16.0.5227.1000 Maybe None Microsoft SharePoint Server 2019 5002028 (Security Update) Critical Remote Code Execution Maybe
Microsoft Word 2013 RT Service Pack 1 5001960 (Security Update) Critical Remote Code Execution Maybe
Microsoft Word 2013 Service Pack 1 (32-bit editions) 5001960 (Security Update) Critical Remote Code Execution Maybe
Microsoft Word 2013 Service Pack 1 (64-bit editions) 5001960 (Security Update) Critical Remote Code Execution Maybe
Microsoft Word 2016 (32-bit edition) 5002004 (Security Update) Critical Remote Code Execution Maybe
Microsoft Word 2016 (64-bit edition) 5002004 (Security Update) Critical Remote Code Execution Maybe

Patches

7 patches
Article Type Restart
Click to Run Security Update No
5002027 Security Update Maybe
5002036 Security Update Maybe
5001924 Security Update Maybe
5002028 Security Update Maybe
5001960 Security Update Maybe
5002004 Security Update Maybe

Known Exploits

On This Page