CVE-2025-54143
CRITICALCVSS 9.8/10EPSS 0.45%
Last modified
CVE-2025-54143 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Sandboxed iframes on webpages could potentially allow downloads to the device, bypassing the expected sandbox restrictions declared on the parent page. This vulnerability was fixed in Firefox for iOS 141.. EPSS estimates a 0.45% chance of exploitation in the next 30 days.
Description
Sandboxed iframes on webpages could potentially allow downloads to the device, bypassing the expected sandbox restrictions declared on the parent page. This vulnerability was fixed in Firefox for iOS 141.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 141.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1912671Issue Tracking, Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2025-60/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2025-54143?
Sandboxed iframes on webpages could potentially allow downloads to the device, bypassing the expected sandbox restrictions declared on the parent page. This vulnerability was fixed in Firefox for iOS 141.
How severe is CVE-2025-54143?
CVE-2025-54143 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.
How do I fix CVE-2025-54143?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2025-54143?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST