What is CVE-2024-53975?

CVE-2024-53975 is a medium-severity vulnerability in Mozilla Firefox. CVSS score: 5.4/10. Published 2024-11-26.

How severe is CVE-2024-53975?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Mozilla Firefox

CVE-2024-53975

Accessing a non-secure HTTP site that uses a non-existent port may cause the SSL padlock icon in the location URL bar to, misleadingly, appear secure. This vulnerability affects Firefox for iOS < 133.

Published 2024-11-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.003 (19.1th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Mozilla Firefox
Mozilla Firefox For iOS — versions unspecified

References

bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
www.mozilla.org/security/advisories/mfsa2024-66/ (Vendor Advisory)

Frequently asked questions

What is CVE-2024-53975?: CVE-2024-53975 is a medium-severity vulnerability in Mozilla Firefox. CVSS score: 5.4/10. Published 2024-11-26.
How severe is CVE-2024-53975?: Medium severity. CVSS v3 base score is 5.4 out of 10.