CVE-2025-21399

Public Exploit
Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability

Description

Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability

Category

7.4
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.32%
Vendor Advisory microsoft.com
Affected: Microsoft Microsoft Edge Update Setup
Published at:
Updated at:

References

Link Tags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21399 vendor advisory
https://www.vicarius.io/vsociety/posts/elevation-of-privilege-vulnerability-in-microsoft-edge-chromium-based-detection-script exploit third party advisory
https://www.vicarius.io/vsociety/posts/elevation-of-privilege-vulnerability-in-microsoft-edge-chromium-based-mitigation-script exploit third party advisory

Frequently Asked Questions

What is the severity of CVE-2025-21399?
CVE-2025-21399 has been scored as a high severity vulnerability.
How to fix CVE-2025-21399?
To fix CVE-2025-21399, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21399 being actively exploited in the wild?
It is possible that CVE-2025-21399 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21399?
CVE-2025-21399 affects Microsoft Microsoft Edge Update Setup.
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