What is CVE-2025-21408?

CVE-2025-21408 is a high-severity vulnerability in Microsoft Edge (Chromium-based), classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 8.8/10. Published 2025-02-06.

How severe is CVE-2025-21408?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Microsoft Edge (Chromium-based)

CVE-2025-21408

Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

EPSS: 0.004 (58.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C.

Affected products

Microsoft Edge (Chromium-based) — versions 1.0.0.0

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2025-21408?: CVE-2025-21408 is a high-severity vulnerability in Microsoft Edge (Chromium-based), classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 8.8/10. Published 2025-02-06.
How severe is CVE-2025-21408?: High severity. CVSS v3 base score is 8.8 out of 10.