Microsoft Office SharePoint
CVE-2021-1641 — Microsoft SharePoint Server Spoofing Vulnerability
Executive Summary
None
Overview
4.6
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
Low
INTEGRITY
Low
AVAILABILITY
None
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 4.0
EPSS Score
0.01828
probability of exploitation in the next 30 days
0.76608 percentile - updated 2026-07-25
View on FIRST.org
Affected Products
3 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft SharePoint Enterprise Server 2016 | 4493163 (Security Update) |
Important | Spoofing | Maybe |
| Microsoft SharePoint Foundation 2013 Service Pack 1 | 4493175 (Security Update) |
Important | Spoofing | Maybe |
| Microsoft SharePoint Server 2019 | 4493162 (Security Update) |
Important | Spoofing | Maybe |
Patches
3 patches
| Article | Type | Restart |
|---|---|---|
4493163 |
Security Update | Maybe |
4493175 |
Security Update | Maybe |
4493162 |
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
Huynh Phuoc Hung, @hph0var
References
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