CVE-2025-54143

CRITICALNVD 9.89.8—

9.8

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.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 29.8%
KEV: Not listed

Published

August 19, 2025

Last Modified

April 13, 2026

Advisory Details (2)

Auto-updated May 18, 2026

No patch confirmed yet.

generic

Security Vulnerabilities fixed in Firefox for iOS 141 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-60/

generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=1912671

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-693Protection Mechanism Failure

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
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2026-05-29 13:44 UTCepss_batch
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2026-05-27 13:40 UTCepss_batch
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2026-05-26 13:44 UTCepss_batch
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2026-05-26 13:43 UTCepss_batch

Frequently asked(5)

What is CVE-2025-54143?

CVE-2025-54143 is a critical vulnerability published on August 19, 2025. 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.

When was CVE-2025-54143 disclosed?

CVE-2025-54143 was first published in the National Vulnerability Database on August 19, 2025, with the most recent update on April 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-54143 actively exploited?

CVE-2025-54143 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-54143?

CVE-2025-54143 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2025-54143?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-54143, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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