Microsoft Office
CVE-2020-1581 — Microsoft Office Click-to-Run Elevation of Privilege Vulnerability
Executive Summary
An elevation of privilege vulnerability exists in the way that Microsoft Office Click-to-Run (C2R) components handle objects in memory. An attacker who successfully exploited the vulnerability could elevate privileges. The attacker would need to already have the ability to execute code on the system. An attacker could exploit this vulnerability by running a specially crafted application on the victim system. The security update addresses the vulnerability by correcting how Microsoft Office Click-to-Run (C2R) components handle objects in memory.
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
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
EPSS Score
0.03717
probability of exploitation in the next 30 days
0.88803 percentile - updated 2026-08-14
View on FIRST.org
Affected Products
6 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft 365 Apps for Enterprise for 32-bit Systems | Click to Run (Security Update) |
Important | Elevation of Privilege | No |
| Microsoft 365 Apps for Enterprise for 64-bit Systems | Click to Run (Security Update) |
Important | Elevation of Privilege | No |
| Microsoft Office 2013 Click-to-Run (C2R) for 32-bit editions | Click to Run (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft Office 2013 Click-to-Run (C2R) for 64-bit editions | Click to Run (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft Office 2019 for 32-bit editions | Click to Run (Security Update) |
Important | Elevation of Privilege | No |
| Microsoft Office 2019 for 64-bit editions | Click to Run (Security Update) |
Important | Elevation of Privilege | No |
Patches
1 patch
| Article | Type | Restart |
|---|---|---|
Click to Run |
Security Update | No |
Exploits & PoC
No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.
Detection Rules
No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.
Acknowledgments
hackyzh and lm0963 of DBAppSecurity Zion Lab working with Trend Micro's Zero Day Initiative
References
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