CVE-2021-31939
Microsoft Excel Remote Code Execution Vulnerability
HIGH
7.8
CVSS Score
Published: June 8, 2021 at 10:46 PM UTC
Updated: June 17, 2026 at 03:52 AM UTC
8 products affected across 1 vendorOffice365 AppsExcel
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Severity
HIGH7.8
Exploit prediction
EPSS 13%
Description
Microsoft Excel Remote Code Execution Vulnerability
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
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
Affected range stops below 15.0.5353.1000, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.0.5173.1000, so it looks safe — our inference, not a vendor statement
https://aka.ms/OfficeSecurityReleases ≤ v < 16.0.10375.20000https://aka.ms/OfficeSecurityReleases
Affected range stops below 16.0.10375.20000, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.0.5353.1000, so it looks safe — our inference, not a vendor statement
15.0.0 ≤ v < 15.0.5353.100015.0.0
Affected range stops below 15.0.5353.1000, so it looks safe — our inference, not a vendor statement
16.0.0 ≤ v < 16.0.5173.100016.0.0
Affected range stops below 16.0.5173.1000, so it looks safe — our inference, not a vendor statement
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 yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (2)
x_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31939x_refsource_MISCThird Party Advisory
Source: [email protected]
https://www.zerodayinitiative.com/advisories/ZDI-21-670/CVSS
7.8HIGHmicrosoft
Vector?
Quick Info
StatusMODIFIED
CWE
NVD-CWE-noinfo
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