How severe is CVE-2025-21393?

CVE-2025-21393 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2025-21393 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-21393?

CVE-2025-21393 primarily affects Microsoft Sharepoint Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-21393?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-21393 have an EU (EUVD) identifier?

Yes. CVE-2025-21393 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2454.

When was CVE-2025-21393 published?

CVE-2025-21393 was published on 2025-01-14 and last updated on 2026-06-17.

CVE-2025-21393

CVE-2025-21393 is a medium-severity vulnerability in Microsoft Sharepoint Server with a CVSS 3.x base score of 6.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-2454
Weakness: CWE-79
Affected product: Microsoft Sharepoint Server
Published: 2025-01-14
Last modified: 2026-06-17

Description

Microsoft SharePoint Server Spoofing Vulnerability

Frequently asked questions

What is CVE-2025-21393?: Microsoft SharePoint Server Spoofing Vulnerability
How severe is CVE-2025-21393?: CVE-2025-21393 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2025-21393 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-21393?: CVE-2025-21393 primarily affects Microsoft Sharepoint Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-21393?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-21393 have an EU (EUVD) identifier?: Yes. CVE-2025-21393 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2454.
When was CVE-2025-21393 published?: CVE-2025-21393 was published on 2025-01-14 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21393

Affected products (3)

cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*
cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*
cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*

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