VulnerabilityModified

CVE-2021-34517

Microsoft SharePoint Server Spoofing Vulnerability

MEDIUM 5.3EPSS 1.97%

Does this matter?

Lower severity and a low EPSS score (1.97%). Track it; it rarely justifies an emergency change on its own.

Description

Microsoft SharePoint Server Spoofing Vulnerability

CVSS 3.1: 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS: 1.97% probability · 80th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Affected: microsoft/sharepoint foundation · microsoft/sharepoint server
Source: secure@microsoft.com

EPSS trend

EPSS 2.0% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34517
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34517Patch, Vendor Advisory

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