Detections
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Mozilla Firefox ESR < 128.12

critical Nessus Plugin ID 240336

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Synopsis

A web browser installed on the remote macOS or Mac OS X host is affected by multiple vulnerabilities.

Description

The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 128.12. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-53 advisory.

 - 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)

 - Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an <code>embed</code> tag. This could have bypassed website security checks that restricted which domains users were allowed to embed. (CVE-2025-6429)

 - When a file download is specified via the <code>Content-Disposition</code> header, that directive would be ignored if the file was included via a <code><embed></code> or <code><object></code> tag, potentially making a website vulnerable to a cross-site scripting attack. (CVE-2025-6430)

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 ESR version 128.12 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2025-53/

Plugin Details

Severity: Critical

ID: 240336

File Name: macos_firefox_128_12_esr.nasl

Version: 1.4

Type: local

Agent: macosx

Published: 6/24/2025

Updated: 7/8/2025

Supported Sensors: 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-2025-6424

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_esr

Required KB Items: MacOSX/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-2025-6429, CVE-2025-6430

IAVA: 2025-A-0451