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UK Cyber Defence
VulnerabilityAnalyzed

CVE-2025-21393

Microsoft SharePoint Server Spoofing Vulnerability

MEDIUM 6.3EPSS 1.06%

Does this matter?

Lower severity and a low EPSS score (1.06%). Track it; it rarely justifies an emergency change on its own.

Description

Microsoft SharePoint Server Spoofing Vulnerability

CVSS 3.1
6.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
EPSS
1.06% probability · 64th percentile
Public exploits
None in Exploit-DB
CISA KEV
Not listed
Weakness
CWE-79
Affected
microsoft/sharepoint server
Source
secure@microsoft.com
EPSS trend
0%3%5%27 October 2026: 1.06%27 October 202627 October 2026

EPSS 1.1% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.