What is CVE-2025-21403?

CVE-2025-21403 is a medium-severity vulnerability in Microsoft On-prem_data_gateway, classified under Incorrect Authorization. CVSS score: 6.4/10. Published 2025-01-14.

How severe is CVE-2025-21403?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Auth bypass in Microsoft On-prem_data_gateway

CVE-2025-21403

On-Premises Data Gateway Information Disclosure Vulnerability

Vulnerability class: Broken Access Control

EPSS: 0.006 (43.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N.

Affected products

Microsoft On-prem_data_gateway
Microsoft On-premises Data Gateway — versions 1.0.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

secure@microsoft.com (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-21403?: CVE-2025-21403 is a medium-severity vulnerability in Microsoft On-prem_data_gateway, classified under Incorrect Authorization. CVSS score: 6.4/10. Published 2025-01-14.
How severe is CVE-2025-21403?: Medium severity. CVSS v3 base score is 6.4 out of 10.