Detections
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Mozilla Firefox ESR < 140.1

critical Nessus Plugin ID 242558

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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 140.1. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-59 advisory.

 - Memory safety bugs present in Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 and Thunderbird 140.
 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-2025-8040)

 - On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack.
 Baseline-JIT, however, read the entire 64 bits. (CVE-2025-8027)

 - On arm64, a WASM <code>brtable</code> instruction with a lot of entries could lead to the label being too far from the instruction causing truncation and incorrect computation of the branch address.
 (CVE-2025-8028)

 - Firefox executed <code>javascript:</code> URLs when used in <code>object</code> and <code>embed</code> tags. (CVE-2025-8029)

 - Firefox cached CORS preflight responses across IP address changes. This allowed circumventing CORS with DNS rebinding. (CVE-2025-8036)

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 140.1 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2025-59/

Plugin Details

Severity: Critical

ID: 242558

File Name: macos_firefox_140_1_esr.nasl

Version: 1.1

Type: local

Agent: macosx

Published: 7/22/2025

Updated: 7/22/2025

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-2025-8040

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: 7/22/2025

Vulnerability Publication Date: 7/22/2025

Reference Information

CVE: CVE-2025-8027, CVE-2025-8028, CVE-2025-8029, CVE-2025-8030, CVE-2025-8031, CVE-2025-8032, CVE-2025-8033, CVE-2025-8034, CVE-2025-8035, CVE-2025-8036, CVE-2025-8037, CVE-2025-8038, CVE-2025-8039, CVE-2025-8040