Microsoft Office Excel
CVE-2021-31939 — Microsoft Excel Remote Code Execution Vulnerability
Executive Summary
None
Overview
7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
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:CATTACK 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
0.13337
probability of exploitation in the next 30 days
0.96058 percentile - updated 2026-08-14
View on FIRST.orgAffected Products
16 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft 365 Apps for Enterprise for 32-bit Systems | Click to Run (Security Update) | Important | Remote Code Execution | No |
| Microsoft 365 Apps for Enterprise for 64-bit Systems | Click to Run (Security Update) | Important | Remote Code Execution | No |
| Microsoft Excel 2013 RT Service Pack 1 | 5001963 (Security Update) | Important | Remote Code Execution | Maybe |
| Microsoft Excel 2013 Service Pack 1 (32-bit editions) | 5001963 (Security Update) | Important | Remote Code Execution | Maybe |
| Microsoft Excel 2013 Service Pack 1 (64-bit editions) | 5001963 (Security Update) | Important | Remote Code Execution | Maybe |
| Microsoft Excel 2016 (32-bit edition) | 5001947 (Security Update) | Important | Remote Code Execution | Maybe |
| Microsoft Excel 2016 (64-bit edition) | 5001947 (Security Update) | Important | Remote Code Execution | Maybe |
| Microsoft Office 2013 RT Service Pack 1 | 5001955 (Security Update) | Important | Remote Code Execution | Maybe |
| Microsoft Office 2013 Service Pack 1 (32-bit editions) | 5001955 (Security Update) | Important | Remote Code Execution | Maybe |
| Microsoft Office 2013 Service Pack 1 (64-bit editions) | 5001955 (Security Update) | Important | Remote Code Execution | Maybe |
| Microsoft Office 2016 (32-bit edition) | 5001951 (Security Update) | Important | Remote Code Execution | Maybe |
| Microsoft Office 2016 (64-bit edition) | 5001951 (Security Update) | Important | Remote Code Execution | Maybe |
| Microsoft Office 2019 for 32-bit editions | Click to Run (Security Update) | Important | Remote Code Execution | No |
| Microsoft Office 2019 for 64-bit editions | Click to Run (Security Update) | Important | Remote Code Execution | No |
| Microsoft Office Web Apps Server 2013 Service Pack 1 | 5001956 (Security Update) | Important | Remote Code Execution | Maybe |
| Office Online Server | 5001943 (Security Update) | Important | Remote Code Execution | Maybe |
Patches
7 patches
| Article | Type | Restart |
|---|---|---|
Click to Run | Security Update | No |
5001963 | Security Update | Maybe |
5001947 | Security Update | Maybe |
5001955 | Security Update | Maybe |
5001951 | Security Update | Maybe |
5001956 | Security Update | Maybe |
5001943 | 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
Ryelv
Jinquan
kdot working with Trend Micro Zero Day Initiative
Zhangjie and willJ from cdsrc
Sagi Tzadik and Netanel Ben-Simon of Check Point Research
References
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