Description

The exception page for the HTTPS-Only feature, displayed when a website is opened via HTTP, lacked an anti-clickjacking delay, potentially allowing an attacker to trick a user into granting an exception and loading a webpage over HTTP. This vulnerability was fixed in Firefox 140 and Thunderbird 140.

INFO

Published Date :

2025-06-24T12:28:04.375Z

Last Modified :

2026-04-13T14:31:11.320Z

Source :

mozilla
AFFECTED PRODUCTS

The following products are affected by CVE-2025-6434 vulnerability.

Vendors Products
Mozilla
  • Firefox
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-6434.

URL Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1955182 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-6434 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-6434 cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-51/ cve-icon cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-54/ cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact