CVE-2025-6429

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2025-06-26. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

A fix is available — apply it.

Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an embed tag. This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
20.4%
KEV
Not listed

Published

June 24, 2025

Last Modified

June 17, 2026

References (7)

Patch Availability(22)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxul-ext-lightning (1:128.12.0+build1-0ubuntu0.22.04.1) @ jammy2026-05-21ubuntu
redhatfirefox-0:128.12.0-1.el8_82025-07-02redhat
redhatfirefox-0:128.12.0-1.el7_92025-07-02redhat
redhatfirefox-0:128.12.0-1.el8_22025-07-02redhat
redhatfirefox-0:128.12.0-1.el8_42025-07-02redhat
redhatthunderbird-0:128.12.0-1.el9_62025-07-02redhat
redhatthunderbird-0:128.12.0-1.el10_02025-07-02redhat
redhatfirefox-0:128.12.0-1.el8_62025-07-02redhat
redhatthunderbird-0:128.12.0-1.el8_102025-07-02redhat
redhatfirefox-0:128.12.0-1.el9_02025-07-02redhat
redhatfirefox-0:128.12.0-1.el9_42025-07-02redhat
redhatfirefox-0:128.12.0-1.el9_22025-07-02redhat
redhatfirefox-0:128.12.0-1.el10_02025-07-01redhat
redhatfirefox-0:128.12.0-1.el8_102025-07-01redhat
redhatthunderbird-0:128.12.0-1.el8_22025-07-01redhat
redhatfirefox-0:128.12.0-1.el9_62025-07-01redhat
redhatthunderbird-0:128.12.0-1.el8_62025-07-01redhat
redhatthunderbird-0:128.12.0-1.el8_82025-07-01redhat
redhatthunderbird-0:128.12.0-1.el9_22025-07-01redhat
redhatthunderbird-0:128.12.0-1.el9_02025-07-01redhat
redhatthunderbird-0:128.12.0-1.el8_42025-07-01redhat
redhatthunderbird-0:128.12.0-1.el9_42025-07-01redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

All Vendor Advisories

(22)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 14× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 119 total refreshes for this CVE.

  1. 2026-07-23 14:18 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2025-6429?
CVE-2025-6429 is a medium vulnerability published on June 24, 2025. Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an embed tag. This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability was fixed in Firefox 140, Firefox ESR…
When was CVE-2025-6429 disclosed?
CVE-2025-6429 was first published in the National Vulnerability Database on June 24, 2025, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-6429 actively exploited?
CVE-2025-6429 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-6429?
CVE-2025-6429 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2025-6429?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-6429, 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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