Detections
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Mozilla Firefox < 139.0

high Nessus Plugin ID 237299

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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 installed on the remote macOS or Mac OS X host is prior to 139.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-42 advisory.

 - Memory safety bugs present in Firefox 138 and Thunderbird 138. 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-2025-5272)

 - In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled.
 (CVE-2025-5270)

 - Error handling for script execution was incorrectly isolated from web content, which could have allowed cross-origin leak attacks. (CVE-2025-5263)

 - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system.
 (CVE-2025-5264)

 - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system.
 This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

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 139.0 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2025-42/

Plugin Details

Severity: High

ID: 237299

File Name: macos_firefox_139_0.nasl

Version: 1.2

Type: local

Agent: macosx

Published: 5/27/2025

Updated: 5/27/2025

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2025-5270

CVSS v3

Risk Factor: High

Base Score: 7.3

Temporal Score: 6.4

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

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

CVSS Score Source: CVE-2025-5272

Vulnerability Information

CPE: cpe:/a:mozilla:firefox

Required KB Items: MacOSX/Firefox/Installed

Exploit Ease: No known exploits are available

Patch Publication Date: 5/27/2025

Vulnerability Publication Date: 5/27/2025

Reference Information

CVE: CVE-2025-5263, CVE-2025-5264, CVE-2025-5265, CVE-2025-5266, CVE-2025-5267, CVE-2025-5268, CVE-2025-5270, CVE-2025-5271, CVE-2025-5272