What is CVE-2025-54145?

CVE-2025-54145 is a critical-severity vulnerability in Mozilla Firefox, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 9.1/10. Published 2025-08-19.

How severe is CVE-2025-54145?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Open Redirect in Mozilla Firefox

CVE-2025-54145

The QR scanner could allow arbitrary websites to be opened if a user was tricked into scanning a malicious link that leveraged Firefox's open-text URL scheme. This vulnerability was fixed in Firefox for iOS 141.

Vulnerability class: Open Redirect

Published 2025-08-19 · last modified 2026-10-05.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (32.1th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Mozilla Firefox
Mozilla Firefox For iOS — versions 141

Weakness classification (CWE)

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

References

bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
www.mozilla.org/security/advisories/mfsa2025-60/ (Vendor Advisory)

Frequently asked questions

What is CVE-2025-54145?: CVE-2025-54145 is a critical-severity vulnerability in Mozilla Firefox, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 9.1/10. Published 2025-08-19.
How severe is CVE-2025-54145?: Critical severity. CVSS v3 base score is 9.1 out of 10.