The version of Firefox installed on the remote Windows 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.

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.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the a14dbea7-3d7c-11f0-9a55-b42e991fc52e advisory.

    security@mozilla.org reports:
    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.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

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

The version of Thunderbird installed on the remote Windows host is prior to 139.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-45 advisory.

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

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5262)

  - 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.

The version of Thunderbird 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 mfsa2025-45 advisory.

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

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5262)

  - 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.

ID	Name	Product	Family	Published	Updated	Severity
237298	Mozilla Firefox < 139.0	Nessus	Windows	5/27/2025	5/30/2025	high
237299	Mozilla Firefox < 139.0	Nessus	MacOS X Local Security Checks	5/27/2025	5/30/2025	high
237614	FreeBSD : Mozilla -- Memory safety bugs (a14dbea7-3d7c-11f0-9a55-b42e991fc52e)	Nessus	FreeBSD Local Security Checks	5/31/2025	5/31/2025	high
237385	Mozilla Thunderbird < 139.0	Nessus	Windows	5/27/2025	5/30/2025	high
237386	Mozilla Thunderbird < 139.0	Nessus	MacOS X Local Security Checks	5/27/2025	5/30/2025	high

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