VULNERABILITY INTELLIGENCE

CVE-2025-6434

CVSS score4.3 MEDIUM
EPSS probability0.28%
CISA KEVNot currently listed
Published2025-06-24
Last modified2026-09-30
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

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.

Weakness classification

  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-1021

Primary references