How severe is CVE-2025-21193?

CVE-2025-21193 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-21193 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-21193?

CVE-2025-21193 primarily affects Microsoft Windows Server 2016. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-21193?

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

Does CVE-2025-21193 have an EU (EUVD) identifier?

Yes. CVE-2025-21193 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2270.

When was CVE-2025-21193 published?

CVE-2025-21193 was published on 2025-01-14 and last updated on 2026-06-17.

CVE-2025-21193

CVE-2025-21193 is a medium-severity vulnerability in Microsoft Windows Server 2016 with a CVSS 3.x base score of 6.5. 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-352.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-2270
Weakness: CWE-352
Affected product: Microsoft Windows Server 2016
Published: 2025-01-14
Last modified: 2026-06-17

Description

Active Directory Federation Server Spoofing Vulnerability

Frequently asked questions

What is CVE-2025-21193?: Active Directory Federation Server Spoofing Vulnerability
How severe is CVE-2025-21193?: CVE-2025-21193 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-21193 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-21193?: CVE-2025-21193 primarily affects Microsoft Windows Server 2016. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-21193?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-21193 have an EU (EUVD) identifier?: Yes. CVE-2025-21193 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2270.
When was CVE-2025-21193 published?: CVE-2025-21193 was published on 2025-01-14 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21193

Affected products (5)

cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*

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