How severe is CVE-2025-21403?

CVE-2025-21403 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2025-21403 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-21403?

CVE-2025-21403 affects Microsoft On-prem Data Gateway. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-21403?

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

Does CVE-2025-21403 have an EU (EUVD) identifier?

Yes. CVE-2025-21403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2463.

When was CVE-2025-21403 published?

CVE-2025-21403 was published on 2025-01-14 and last updated on 2026-06-17.

CVE-2025-21403

CVE-2025-21403 is a medium-severity vulnerability in Microsoft On-prem Data Gateway with a CVSS 3.x base score of 6.4. 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-863.

Key facts

Severity: Medium (CVSS 3.x base score 6.4)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-2463
Weakness: CWE-863
Affected product: Microsoft On-prem Data Gateway
Published: 2025-01-14
Last modified: 2026-06-17

Description

On-Premises Data Gateway Information Disclosure Vulnerability

Frequently asked questions

What is CVE-2025-21403?: On-Premises Data Gateway Information Disclosure Vulnerability
How severe is CVE-2025-21403?: CVE-2025-21403 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2025-21403 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-21403?: CVE-2025-21403 affects Microsoft On-prem Data Gateway. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-21403?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-21403 have an EU (EUVD) identifier?: Yes. CVE-2025-21403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2463.
When was CVE-2025-21403 published?: CVE-2025-21403 was published on 2025-01-14 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21403

Affected products (1)

cpe:2.3:a:microsoft:on-prem_data_gateway:*:*:*:*:*:*:*:*

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