Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.

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 a4bebda9-b808-11f0-8016-b42e991fc52e advisory.

    https://bugzilla.mozilla.org/show_bug.cgi?id=1978453 reports:
    Mitigation bypass in the Web Compatibility: Tooling                 component.

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 FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the a240c31b-a394-11f0-9617-b42e991fc52e advisory.

    security@mozilla.org reports:
    The vulnerability has been rated as having moderate               impact, affecting both confidentiality and integrity               with low severity, while having no impact on               availability. For Thunderbird specifically, the               vulnerability cannot be exploited through email as               scripting is disabled when reading mail, but remains a               potential risk in browser or browser-like contexts

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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability was fixed in Firefox 143     and Thunderbird 143. (CVE-2025-10531)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 143.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-73 advisory.

  - Memory safety bugs present in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142.
    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-2025-10537)

  - Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability affects     Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3. (CVE-2025-10527)

  - Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component. This     vulnerability affects Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3.
    (CVE-2025-10528)

  - Same-origin policy bypass in the Layout component. This vulnerability affects Firefox < 143, Firefox ESR <     140.3, Thunderbird < 143, and Thunderbird < 140.3. (CVE-2025-10529)

  - Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability affects Firefox < 143     and Thunderbird < 143. (CVE-2025-10530)

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 Windows host is prior to 143.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-73 advisory.

  - Memory safety bugs present in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142.
    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-2025-10537)

  - Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability affects     Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3. (CVE-2025-10527)

  - Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component. This     vulnerability affects Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3.
    (CVE-2025-10528)

  - Same-origin policy bypass in the Layout component. This vulnerability affects Firefox < 143, Firefox ESR <     140.3, Thunderbird < 143, and Thunderbird < 140.3. (CVE-2025-10529)

  - Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability affects Firefox < 143     and Thunderbird < 143. (CVE-2025-10530)

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 Windows host is prior to 143.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-77 advisory.

  - Memory safety bugs present in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142.
    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-2025-10537)

  - Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability affects     Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3. (CVE-2025-10527)

  - Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component. This     vulnerability affects Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3.
    (CVE-2025-10528)

  - Same-origin policy bypass in the Layout component. This vulnerability affects Firefox < 143, Firefox ESR <     140.3, Thunderbird < 143, and Thunderbird < 140.3. (CVE-2025-10529)

  - Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability affects Firefox < 143     and Thunderbird < 143. (CVE-2025-10530)

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 143.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-77 advisory.

  - Memory safety bugs present in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142.
    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-2025-10537)

  - Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability affects     Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3. (CVE-2025-10527)

  - Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component. This     vulnerability affects Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3.
    (CVE-2025-10528)

  - Same-origin policy bypass in the Layout component. This vulnerability affects Firefox < 143, Firefox ESR <     140.3, Thunderbird < 143, and Thunderbird < 140.3. (CVE-2025-10529)

  - Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability affects Firefox < 143     and Thunderbird < 143. (CVE-2025-10530)

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

The remote Fedora 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-100ae879e3 advisory.

    - New upstream release (143.0)

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

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

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-4dca10ca2c advisory.

    - New upstream release (143.0)

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

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	Type	Severity
272209	FreeBSD : Firefox -- Mitigation bypass (a4bebda9-b808-11f0-8016-b42e991fc52e)	Nessus	FreeBSD Local Security Checks	Local	medium
269695	FreeBSD : Mozilla -- mitigation bypass vulnerability (a240c31b-a394-11f0-9617-b42e991fc52e)	Nessus	FreeBSD Local Security Checks	Local	medium
265632	Linux Distros Unpatched Vulnerability : CVE-2025-10531	Nessus	Misc.	Local	medium
265450	Mozilla Firefox < 143.0	Nessus	MacOS X Local Security Checks	Local	high
265449	Mozilla Firefox < 143.0	Nessus	Windows	Local	high
265448	Mozilla Thunderbird < 143.0	Nessus	Windows	Local	high
265447	Mozilla Thunderbird < 143.0	Nessus	MacOS X Local Security Checks	Local	high
265386	Fedora 41 : firefox (2025-100ae879e3)	Nessus	Fedora Local Security Checks	Local	high
265310	Fedora 42 : firefox (2025-4dca10ca2c)	Nessus	Fedora Local Security Checks	Local	high

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