CVE-2021-40484
Microsoft SharePoint Server Spoofing Vulnerability
HIGH
7.6
CVSS Score
Published: October 13, 2021 at 12:27 AM UTC
Updated: June 17, 2026 at 04:07 AM UTC
5 products affected across 1 vendorSharePoint ServerSharePoint Enterprise ServerSharePoint Foundation
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Severity
HIGH7.6
Exploit prediction
EPSS 1%
SSVC
No known exploit
Description
Microsoft SharePoint Server Spoofing Vulnerability
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Affected range stops below 15.0.5389.1000, so it looks safe — our inference, not a vendor statement
16.0.0 ≤ v < 16.0.5227.100016.0.0
Affected range stops below 16.0.5227.1000, so it looks safe — our inference, not a vendor statement
16.0.0 ≤ v < 16.0.10379.2000016.0.0
Affected range stops below 16.0.10379.20000, 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 (1)
x_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40484SSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
7.6HIGHmicrosoft
Vector?
Quick Info
StatusMODIFIED
CWE
NVD-CWE-noinfo
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