Detections
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Mozilla Firefox ESR < 128.11

medium Nessus Plugin ID 237297

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Synopsis

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

Description

The version of Firefox ESR installed on the remote Windows host is prior to 128.11. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-44 advisory.

 - Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. (CVE-2025-5269)

 - 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)

 - 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)

 - Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. (CVE-2025-5266)

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 128.11 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2025-44/

Plugin Details

Severity: Medium

ID: 237297

File Name: mozilla_firefox_128_11_esr.nasl

Version: 1.2

Type: local

Agent: windows

Family: Windows

Published: 5/27/2025

Updated: 5/27/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2025-5269

CVSS v3

Risk Factor: Medium

Base Score: 4.8

Temporal Score: 4.2

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

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

CVSS Score Source: CVE-2025-5265

Vulnerability Information

CPE: cpe:/a:mozilla:firefox_esr

Required KB Items: Mozilla/Firefox/Version

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-2025-5269