Vulnerability · NVD

CVE-2025-6434

CVE-2025-6434, medium severity (CVSS 4.3): 1 tracked app concerned, all fixed or indeterminable on their current version.

Severity (CVSS): 4.3
Exploitation: -
Tracked apps: 1
Still exposed: 0

Published on 2025-06-24

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.

Attack vector : Network No privileges required

Show raw CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Tracked apps referencing this CVE

For each app: the affected range, the fixing version, and where the tracked app stands today.

Mozilla Firefox Windows winget:Mozilla.Firefox

Affected <140.0 Fixed in 140.0 Latest tracked 157.0 patched

Observed affected builds (123)

139.0.4 139.0.1 139.0 138.0.4 138.0.3 138.0.1 138.0 137.0.2 137.0.1 137.0 136.0.4 136.0.3 136.0.2 136.0.1 136.0 135.0.1 135.0 134.0.2 134.0.1 134.0 133.0.3 133.0 132.0.2 132.0.1 132.0 131.0.3 131.0.2 131.0 130.0.1 130.0 +93 · see history

Vulnerable CPE configurations (1)

Vendor	Product	Platform	Versions	CPE 2.3 URI
mozilla	firefox All platforms (wildcard)	All platforms (wildcard)	<140.0	cpe:2.3:a:mozilla:firefox:::::-:::*

View on NVD ↗ Advisory · www.mozilla.org

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