Memory safety bugs present in Firefox 133 and Thunderbird 133. 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. This vulnerability was fixed in Firefox 134 and Thunderbird 134.

The remote Ubuntu 22.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7991-1 advisory.

    Multiple security issues were discovered in Thunderbird. If a user were tricked into opening a specially     crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of     service, obtain sensitive information, bypass security restrictions, cross-site tracing, or execute     arbitrary code.

Tenable has extracted the preceding description block directly from the Ubuntu 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Memory safety bugs present in Firefox 133 and Thunderbird 133. 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. This vulnerability was fixed in Firefox 134 and Thunderbird 134. (CVE-2025-0247)

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 a vulnerability as referenced in the f9d7b6ae-116c-11f0-8b2c-b42e991fc52e advisory.

    security@mozilla.org reports:
    Memory safety bugs present in Firefox 133 and Thunderbird 133.
              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 remote host is affected by the vulnerability described in GLSA-202501-10 (Mozilla Firefox: Multiple Vulnerabilities)

    Multiple vulnerabilities have been discovered in Mozilla Firefox. Please review the CVE identifiers     referenced below for details.

Tenable has extracted the preceding description block directly from the Gentoo Linux 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 Windows host is prior to 134.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-04 advisory.

  - Memory safety bugs present in Firefox 133 and Thunderbird 133. 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-2025-0247)

  - Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5,     Thunderbird 115.18, and Thunderbird 128.5. 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-2025-0242)

  - The Matrix specification demands homeservers to perform validation of the server-name and media-id     components of MXC URIs with the intent to prevent path traversal. However, it is not mentioned that a     similar check must also be performed on the client to prevent client-side path traversal. matrix-js-sdk     fails to perform this validation. (CVE-2024-50336)

  - The WebChannel API, which is used to transport various information across processes, did not check the     sending principal but rather accepted the principal being sent. This could have led to privilege     escalation attacks. (CVE-2025-0237)

  - Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, leading to     a potentially exploitable crash. (CVE-2025-0238)

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 134.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-04 advisory.

  - Memory safety bugs present in Firefox 133 and Thunderbird 133. 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-2025-0247)

  - Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5,     Thunderbird 115.18, and Thunderbird 128.5. 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-2025-0242)

  - The Matrix specification demands homeservers to perform validation of the server-name and media-id     components of MXC URIs with the intent to prevent path traversal. However, it is not mentioned that a     similar check must also be performed on the client to prevent client-side path traversal. matrix-js-sdk     fails to perform this validation. (CVE-2024-50336)

  - The WebChannel API, which is used to transport various information across processes, did not check the     sending principal but rather accepted the principal being sent. This could have led to privilege     escalation attacks. (CVE-2025-0237)

  - Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, leading to     a potentially exploitable crash. (CVE-2025-0238)

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 40 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-e8a71b6caf advisory.

    - Updated to latest upstream (134.0)

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 Ubuntu 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7191-1 advisory.

    Multiple security issues were discovered in Firefox. If a user were tricked into opening a specially     crafted website, an attacker could potentially exploit these to cause a denial of service, obtain     sensitive information across domains, or execute arbitrary code. (CVE-2025-0237, CVE-2025-0239,     CVE-2025-0240, CVE-2025-0242, CVE-2025-0243, CVE-2025-0247)

    Irvan Kurniawan discovered that Firefox incorrectly handled memory when breaking lines in text, leading to     a use-after-free vulnerability. An attacker could possibly use this issue to cause a denial of service or     possibly execute arbitrary code. (CVE-2025-0238)

    Nils Bars discovered that Firefox incorrectly handled memory when using JavaScript Text Segmentation. An     attacker could possibly use this issue to cause a denial of service. (CVE-2025-0241)

Tenable has extracted the preceding description block directly from the Ubuntu 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-2025-6fcde64d77 advisory.

    - Updated to latest upstream (134.0)

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 Firefox installed on the remote Windows host is prior to 134.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-01 advisory.

  - Memory safety bugs present in Firefox 133 and Thunderbird 133. 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-2025-0247)

  - Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5,     Thunderbird 115.18, and Thunderbird 128.5. 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-2025-0242)

  - In resizeToAtLeast of SkRegion.cpp, there was a possible out of bounds write due to an integer overflow     (CVE-2024-43097)

  - When redirecting to an invalid protocol scheme, an attacker could spoof the address bar.  Note: This issue     only affected Android operating systems. Other operating systems are unaffected. (CVE-2025-0244)

  - Under certain circumstances, a user opt-in setting that Focus should require authentication before use     could have been be bypassed. (CVE-2025-0245)

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 134.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-01 advisory.

  - Memory safety bugs present in Firefox 133 and Thunderbird 133. 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-2025-0247)

  - Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5,     Thunderbird 115.18, and Thunderbird 128.5. 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-2025-0242)

  - In resizeToAtLeast of SkRegion.cpp, there was a possible out of bounds write due to an integer overflow     (CVE-2024-43097)

  - When redirecting to an invalid protocol scheme, an attacker could spoof the address bar.  Note: This issue     only affected Android operating systems. Other operating systems are unaffected. (CVE-2025-0244)

  - Under certain circumstances, a user opt-in setting that Focus should require authentication before use     could have been be bypassed. (CVE-2025-0245)

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
297659	Ubuntu 22.04 LTS : Thunderbird vulnerabilities (USN-7991-1)	Nessus	Ubuntu Local Security Checks	Local	medium
247377	Linux Distros Unpatched Vulnerability : CVE-2025-0247	Nessus	Misc.	Local	critical
233890	FreeBSD : Mozilla -- Memory safety bugs (f9d7b6ae-116c-11f0-8b2c-b42e991fc52e)	Nessus	FreeBSD Local Security Checks	Local	critical
214554	GLSA-202501-10 : Mozilla Firefox: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	Local	high
213633	Mozilla Thunderbird < 134.0	Nessus	Windows	Local	medium
213632	Mozilla Thunderbird < 134.0	Nessus	MacOS X Local Security Checks	Local	medium
213613	Fedora 40 : firefox (2025-e8a71b6caf)	Nessus	Fedora Local Security Checks	Local	critical
213603	Ubuntu 20.04 LTS : Firefox vulnerabilities (USN-7191-1)	Nessus	Ubuntu Local Security Checks	Local	critical
213553	Fedora 41 : firefox (2025-6fcde64d77)	Nessus	Fedora Local Security Checks	Local	critical
213528	Mozilla Firefox < 134.0	Nessus	Windows	Local	critical
213527	Mozilla Firefox < 134.0	Nessus	MacOS X Local Security Checks	Local	critical

Detections

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CVE-2025-0247

critical

Tenable Plugins

medium

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critical

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medium

medium

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critical