Mozilla Firefox < 140.0

critical Nessus Plugin ID 240334

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Synopsis

A web browser installed on the remote Windows host is affected by multiple vulnerabilities.

Description

The version of Firefox installed on the remote Windows host is prior to 140.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-51 advisory.

- Memory safety bugs present in Firefox 139 and Thunderbird 139. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. (CVE-2025-6436)

- A use-after-free in FontFaceSet resulted in a potentially exploitable crash. (CVE-2025-6424)

- An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. (CVE-2025-6425)

- The executable file warning did not warn users before opening files with the <code>terminal</code> extension. This bug only affects Firefox for macOS. Other versions of Firefox are unaffected.
(CVE-2025-6426)

- An attacker was able to bypass the <code>connect-src</code> directive of a Content Security Policy by manipulating subdocuments. This would have also hidden the connections from the Network tab in Devtools.
(CVE-2025-6427)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Mozilla Firefox version 140.0 or later.

Plugin Details

Severity: Critical

ID: 240334

File Name: mozilla_firefox_140_0.nasl

Version: 1.1

Type: local

Agent: windows

Family: Windows

Published: 6/24/2025

Updated: 6/24/2025

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2025-6436

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:mozilla:firefox

Required KB Items: Mozilla/Firefox/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 6/24/2025

Vulnerability Publication Date: 6/24/2025

Reference Information

CVE: CVE-2025-6424, CVE-2025-6425, CVE-2025-6426, CVE-2025-6427, CVE-2025-6428, CVE-2025-6429, CVE-2025-6430, CVE-2025-6431, CVE-2025-6432, CVE-2025-6433, CVE-2025-6434, CVE-2025-6435, CVE-2025-6436

Detections

Analytics