CVE-2025-6434CWE-1021

CVE-2025-6434

Medium · published June 24, 2025

CVSS v3.1
4.3
EPSS
0%
Percentile
19.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00283 · 19.7th percentile
Weakness
CWE-1021 · Improper Restriction of Rendered UI Layers or Frames
Published
2025-06-24T17:15Z
Affected products (1)
ProductVersionsFixed in
mozilla/firefox< 140.0140.0
References (3)
https://www.mozilla.org/security/advisories/mfsa2025-51/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-54/ · [email protected]https://bugzilla.mozilla.org/show_bug.cgi?id=1955182 · [email protected]
EPSS history
Timeline
  • 24 JUN 12:28Z
    HTTPS-Only exception screen lacked anti-clickjacking delay
    cvelistv5