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CVE-2020-16955

Microsoft Office Click-to-Run Elevation of Privilege Vulnerability

HIGH
7.8
CVSS Score
Published: October 16, 2020 at 10:18 PM UTC
Updated: June 17, 2026 at 02:58 AM UTC
4 products affected across 1 vendorOffice365 AppsOffice 2019

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Severity
HIGH7.8
Exploit prediction
EPSS 3%
SSVC
No known exploit

Description

<p>An elevation of privilege vulnerability exists in the way that Microsoft Office Click-to-Run (C2R) AppVLP handles certain files. An attacker who successfully exploited the vulnerability could elevate privileges.</p> <p>To exploit this vulnerability, an attacker would need to convince a user to open a specially crafted file.</p> <p>The security update addresses the vulnerability by correcting how Microsoft Office Click-to-Run (C2R) components handle these files.</p>

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

365 Apps· Microsoft
95%
16.0.1 ≤ v < https://aka.ms/OfficeSecurityReleases16.0.1
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Office· Microsoft
95%
20132019
Office 2013· Microsoft
60%
15.0.0.0 ≤ v < 15.0.5571.100015.0.0.0
Affected range stops below 15.0.5571.1000, so it looks safe — our inference, not a vendor statement
Office 2019· Microsoft
60%
19.0.0 ≤ v < https://aka.ms/OfficeSecurityReleases19.0.0
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16955

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHmicrosoft
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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