Focus incorrectly truncated URLs towards the beginning instead of around the origin. This vulnerability affects Firefox < 141 and Thunderbird < 141.

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

  - Focus incorrectly truncated URLs towards the beginning instead of around the origin. This vulnerability     affects Firefox < 141 and Thunderbird < 141. (CVE-2025-8043)

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

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 67c6461f-685e-11f0-a12d-b42e991fc52e advisory.

    security@mozilla.org reports:
    Memory safety bugs present in 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.
    Focus incorrectly truncated URLs towards the beginning instead of                 around the origin.

Tenable has extracted the preceding description block directly from the FreeBSD 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 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-2fac68f810 advisory.

    - Updated to latest upstream (141.0)

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-2025-81e513fb49 advisory.

    - Updated to latest upstream (141.0)

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 version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 141.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-61 advisory.

  - Memory safety bugs present in 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-2025-8044)

  - 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)

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

  - Thunderbird 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.

The version of Thunderbird installed on the remote Windows host is prior to 141.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-61 advisory.

  - Memory safety bugs present in 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-2025-8044)

  - 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)

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

  - Thunderbird 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.

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 141.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-56 advisory.

  - Memory safety bugs present in 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-2025-8044)

  - 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)

  - In the address bar, Firefox for Android truncated the display of URLs from the end instead of prioritizing     the origin. (CVE-2025-8041)

  - Firefox for Android allowed a sandboxed iframe without the <code>allow-downloads</code> attribute to start     downloads. (CVE-2025-8042)

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 141.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-56 advisory.

  - Memory safety bugs present in 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-2025-8044)

  - 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)

  - In the address bar, Firefox for Android truncated the display of URLs from the end instead of prioritizing     the origin. (CVE-2025-8041)

  - Firefox for Android allowed a sandboxed iframe without the <code>allow-downloads</code> attribute to start     downloads. (CVE-2025-8042)

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	Severity
246339	Linux Distros Unpatched Vulnerability : CVE-2025-8043	Nessus	Misc.	critical
242923	FreeBSD : Mozilla -- Multiple vulnerabilities (67c6461f-685e-11f0-a12d-b42e991fc52e)	Nessus	FreeBSD Local Security Checks	critical
242665	Fedora 41 : firefox (2025-2fac68f810)	Nessus	Fedora Local Security Checks	critical
242599	Fedora 42 : firefox (2025-81e513fb49)	Nessus	Fedora Local Security Checks	critical
242579	Mozilla Thunderbird < 141.0	Nessus	MacOS X Local Security Checks	critical
242578	Mozilla Thunderbird < 141.0	Nessus	Windows	critical
242556	Mozilla Firefox < 141.0	Nessus	MacOS X Local Security Checks	critical
242555	Mozilla Firefox < 141.0	Nessus	Windows	critical

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CVE-2025-8043

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