What is CVE-2025-6428?

CVE-2025-6428 is a medium-severity vulnerability in Google Android, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2025-06-24.

How severe is CVE-2025-6428?

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

Open Redirect in Google Android

CVE-2025-6428

When a URL was provided in a link querystring parameter, Firefox for Android would follow that URL instead of the correct URL, potentially leading to phishing attacks. *This bug only affects Firefox for Android. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox 140.

Vulnerability class: Open Redirect

Published 2025-06-24 · last modified 2026-09-30.

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.

EPSS exploit prediction

EPSS: 0.002 (12.1th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Google Android
Mozilla Firefox — versions 140

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

bugzilla.mozilla.org/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2025-51/ (Vendor Advisory)

Frequently asked questions

What is CVE-2025-6428?: CVE-2025-6428 is a medium-severity vulnerability in Google Android, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2025-06-24.
How severe is CVE-2025-6428?: Medium severity. CVSS v3 base score is 4.3 out of 10.