CVE-2025-6434

firefox: HTTPS-Only exception screen lacked anti-clickjacking delay

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Severity

Low

Red Hat Product Security

3.4

CVSS 3.1

Review impact separately from score.

Published · June 24, 2025

Updated · June 30, 2026

Description

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: 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.

Statement

Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 3.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N

CWE not specified