How severe is CVE-2025-21400?

CVE-2025-21400 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-21400 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 30% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-21400?

CVE-2025-21400 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-2025-21400?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-21400 have an EU (EUVD) identifier?

Yes. CVE-2025-21400 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2460.

When was CVE-2025-21400 published?

CVE-2025-21400 was published on 2025-02-11 and last updated on 2026-06-17.

CVE-2025-21400

CVE-2025-21400 is a high-severity vulnerability in Microsoft Sharepoint Server with a CVSS 3.x base score of 8.0. Its EPSS exploit-prediction score of 30% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-285.

Key facts

Severity: High (CVSS 3.x base score 8.0)
EPSS exploit prediction: 30% (98th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-2460
Weakness: CWE-285
Affected product: Microsoft Sharepoint Server
Published: 2025-02-11
Last modified: 2026-06-17

Description

Microsoft SharePoint Server Remote Code Execution Vulnerability

Frequently asked questions

What is CVE-2025-21400?: Microsoft SharePoint Server Remote Code Execution Vulnerability
How severe is CVE-2025-21400?: CVE-2025-21400 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-21400 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 30% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-21400?: CVE-2025-21400 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-2025-21400?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-21400 have an EU (EUVD) identifier?: Yes. CVE-2025-21400 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2460.
When was CVE-2025-21400 published?: CVE-2025-21400 was published on 2025-02-11 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21400

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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