What is CVE-2025-21404?

CVE-2025-21404 is a medium-severity vulnerability in Microsoft Edge (Chromium-based), classified under CWE-449. CVSS score: 4.3/10. Published 2025-02-06.

How severe is CVE-2025-21404?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Microsoft Edge (Chromium-based)

CVE-2025-21404

Microsoft Edge (Chromium-based) Spoofing Vulnerability

EPSS: 0.002 (39.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C.

Affected products

Microsoft Edge (Chromium-based) — versions 1.0.0.0

Weakness classification (CWE)

CWE-449

References

Microsoft Edge (Chromium-based) Spoofing Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2025-21404?: CVE-2025-21404 is a medium-severity vulnerability in Microsoft Edge (Chromium-based), classified under CWE-449. CVSS score: 4.3/10. Published 2025-02-06.
How severe is CVE-2025-21404?: Medium severity. CVSS v3 base score is 4.3 out of 10.