CVE-2025-6434

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-6434
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 affects Firefox < 140 and Thunderbird < 140.

4.3 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1955182 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-51/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-54/
Configurations

Configuration 1 (hide)

cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
History

14 Jul 2025, 19:15

Type Values Removed Values Added
References
  • () https://www.mozilla.org/security/advisories/mfsa2025-54/ -
Summary (en) 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 affects Firefox < 140. (en) 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 affects Firefox < 140 and Thunderbird < 140.

03 Jul 2025, 16:04

Type Values Removed Values Added
First Time Mozilla
Mozilla firefox
References () https://bugzilla.mozilla.org/show_bug.cgi?id=1955182 - () https://bugzilla.mozilla.org/show_bug.cgi?id=1955182 - Permissions Required
References () https://www.mozilla.org/security/advisories/mfsa2025-51/ - () https://www.mozilla.org/security/advisories/mfsa2025-51/ - Vendor Advisory
CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*

25 Jun 2025, 15:15

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 4.3
Summary
  • (es) La página de excepción de la función Solo HTTPS, que se mostraba al abrir un sitio web mediante HTTP, carecía de un retardo anti-clickjacking, lo que potencialmente permitía a un atacante engañar al usuario para que concediera una excepción y cargara una página web mediante HTTP. Esta vulnerabilidad afecta a Firefox anterior a la versión 140.
CWE CWE-1021

24 Jun 2025, 13:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-06-24 13:15

Updated : 2025-07-14 19:15

NVD link : CVE-2025-6434

Mitre link : CVE-2025-6434

CVE.ORG link : CVE-2025-6434

JSON object : View

Products Affected

mozilla

  • firefox
CWE
CWE-1021

Improper Restriction of Rendered UI Layers or Frames