Microsoft Office Excel
CVE-2021-28454 — 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:P/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
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.0
EPSS Score
0.03138
probability of exploitation in the next 30 days
0.86226 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 | 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 2010 Service Pack 2 (32-bit editions) | 3017810 (Security Update) |
Important | Remote Code Execution | Maybe |
| Microsoft Excel 2010 Service Pack 2 (64-bit editions) | 3017810 (Security Update) |
Important | Remote Code Execution | Maybe |
| Microsoft Excel 2013 RT Service Pack 1 | 4504735 (Security Update) |
Important | Remote Code Execution | Maybe |
| Microsoft Excel 2013 Service Pack 1 (32-bit editions) | 4504735 (Security Update) |
Important | Remote Code Execution | Maybe |
| Microsoft Excel 2013 Service Pack 1 (64-bit editions) | 4504735 (Security Update) |
Important | Remote Code Execution | Maybe |
| Microsoft Excel 2016 (32-bit edition) | 4504721 (Security Update) |
Important | Remote Code Execution | Maybe |
| Microsoft Excel 2016 (64-bit edition) | 4504721 (Security Update) |
Important | Remote Code Execution | Maybe |
| Microsoft Office 2010 Service Pack 2 (32-bit editions) | 4504739 (Security Update) |
Important | Remote Code Execution | Maybe |
| Microsoft Office 2010 Service Pack 2 (64-bit editions) | 4504739 (Security Update) |
Important | Remote Code Execution | Maybe |
| Microsoft Office 2013 RT Service Pack 1 | 4504727 (Security Update) |
Important | Remote Code Execution | Maybe |
| Microsoft Office 2013 Service Pack 1 (32-bit editions) | 4504727 (Security Update) |
Important | Remote Code Execution | Maybe |
| Microsoft Office 2013 Service Pack 1 (64-bit editions) | 4504727 (Security Update) |
Important | Remote Code Execution | Maybe |
| Microsoft Office 2016 (32-bit edition) | 4504724 (Security Update) |
Important | Remote Code Execution | Maybe |
| Microsoft Office 2016 (64-bit edition) | 4504724 (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 Online Server | 4504714 (Security Update) |
Important | Remote Code Execution | Maybe |
| Microsoft Office Web Apps Server 2013 Service Pack 1 | 4504729 (Security Update) |
Important | Remote Code Execution | Maybe |
Patches
9 patches
| Article | Type | Restart |
|---|---|---|
Click to Run |
Security Update | No |
3017810 |
Security Update | Maybe |
4504735 |
Security Update | Maybe |
4504721 |
Security Update | Maybe |
4504739 |
Security Update | Maybe |
4504727 |
Security Update | Maybe |
4504724 |
Security Update | Maybe |
4504714 |
Security Update | Maybe |
4504729 |
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
AIOFuzzer Working with Trend Micro Zero Day Initiative
References
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