Mozilla Firefox up to 139 HTTPS-Only Feature clickjacking

CVSS Meta Temp Score
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CTI Interest Score
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4.1$5k-$25k0.00

Summaryinfo

A vulnerability was found in Mozilla Firefox up to 139. It has been rated as problematic. This affects an unknown function of the component HTTPS-Only Feature. Performing a manipulation results in clickjacking. This vulnerability is identified as CVE-2025-6434. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Mozilla Firefox up to 139. This affects an unknown function of the component HTTPS-Only Feature. The manipulation with an unknown input leads to a clickjacking vulnerability. CWE is classifying the issue as CWE-451. The user interface (UI) does not properly represent critical information to the user, allowing the information - or its source - to be obscured or spoofed. This is often a component in phishing attacks. This is going to have an impact on integrity. The summary by CVE 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 affects Firefox < 140.

The advisory is shared at bugzilla.mozilla.org. This vulnerability is uniquely identified as CVE-2025-6434 since 06/20/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/17/2025). MITRE ATT&CK project uses the attack technique T1566.003 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 242306 (SUSE SLES12 Security Update : MozillaFirefox, MozillaFirefox-branding-SLE (SUSE-SU-2025:02339-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 140 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (242306), EUVD (EUVD-2025-21375) and CERT Bund (WID-SEC-2025-1850). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Xerox FreeFlow Print Server

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Clickjacking
CWE: CWE-451
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 242306
Nessus Name: SUSE SLES12 Security Update : MozillaFirefox, MozillaFirefox-branding-SLE (SUSE-SU-2025:02339-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Firefox 140

Timelineinfo

06/20/2025 🔍
06/24/2025 +4 days 🔍
06/24/2025 +0 days 🔍
08/17/2025 +53 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: bugzilla.mozilla.org
Status: Confirmed

CVE: CVE-2025-6434 (🔍)
GCVE (CVE): GCVE-0-2025-6434
GCVE (VulDB): GCVE-100-313761
EUVD: 🔍
CERT Bund: WID-SEC-2025-1850 - Xerox FreeFlow Print Server: Mehrere Schwachstellen erm&ouml;glichen nicht spezifizierten Angriff

Entryinfo

Created: 06/24/2025 15:34
Updated: 08/17/2025 01:41
Changes: 06/24/2025 15:34 (56), 06/26/2025 02:16 (1), 07/14/2025 21:28 (1), 07/18/2025 21:08 (2), 08/17/2025 01:41 (7)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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