Memory safety bugs present in Firefox 135 and Thunderbird 135. 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 affects Firefox < 136 and Thunderbird < 136.

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 135 and Thunderbird 135. 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 affects Firefox < 136 and Thunderbird < 136. (CVE-2025-1943)

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

The remote host is affected by the vulnerability described in GLSA-202505-02 (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 FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 37c368f1-10a2-11f0-8195-b42e991fc52e advisory.

    security@mozilla.org reports:
    Memory safety bugs present in Firefox 135 and Thunderbird               135. 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 Fedora 40 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-100adaf12d advisory.

    - Updated to latest upstream (136.0)

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 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-60c0e24d76 advisory.

    - Updated to latest upstream (136.0)

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 Windows host is prior to 136.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-17 advisory.

  - Memory safety bugs present in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7. 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-2025-1938)

  - An inconsistent comparator in xslt/txNodeSorter could have resulted in potentially exploitable out-of-     bounds access. Only affected version 122 and later. (CVE-2025-1932)

  - Certain crafted MIME email messages that claimed to contain an encrypted OpenPGP message, which instead     contained an OpenPGP signed message, were wrongly shown as being encrypted. (CVE-2025-26696)

  - When requesting an OpenPGP key from a WKD server, an incorrect padding size was used and a network     observer could have learned the length of the requested email address. (CVE-2025-26695)

  - On Windows, a compromised content process could use bad StreamData sent over AudioIPC to trigger a use-     after-free in the Browser process. This could have led to a sandbox escape. (CVE-2025-1930)

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 136.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-17 advisory.

  - Memory safety bugs present in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7. 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-2025-1938)

  - An inconsistent comparator in xslt/txNodeSorter could have resulted in potentially exploitable out-of-     bounds access. Only affected version 122 and later. (CVE-2025-1932)

  - Certain crafted MIME email messages that claimed to contain an encrypted OpenPGP message, which instead     contained an OpenPGP signed message, were wrongly shown as being encrypted. (CVE-2025-26696)

  - When requesting an OpenPGP key from a WKD server, an incorrect padding size was used and a network     observer could have learned the length of the requested email address. (CVE-2025-26695)

  - On Windows, a compromised content process could use bad StreamData sent over AudioIPC to trigger a use-     after-free in the Browser process. This could have led to a sandbox escape. (CVE-2025-1930)

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 136.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-14 advisory.

  - Malicious pages could use Firefox for Android to pass FIDO: links to the OS and trigger the hybrid     passkey transport. An attacker within Bluetooth range could have used this to trick the user into using     their passkey to log the attacker's computer into the target account. (CVE-2024-9956)

  - On Windows, a compromised content process could use bad StreamData sent over AudioIPC to trigger a use-     after-free in the Browser process. This could have led to a sandbox escape. (CVE-2025-1930)

  - Android apps can load web pages using the Custom Tabs feature. This feature supports a transition     animation that could have been used to trick a user into granting sensitive permissions by hiding what the     user was actually clicking. (CVE-2025-1939)

  - It was possible to cause a use-after-free in the content process side of a WebTransport connection,     leading to a potentially exploitable crash. (CVE-2025-1931)

  - An inconsistent comparator in xslt/txNodeSorter could have resulted in potentially exploitable out-of-     bounds access. Only affected version 122 and later. (CVE-2025-1932)

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 136.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-14 advisory.

  - Malicious pages could use Firefox for Android to pass FIDO: links to the OS and trigger the hybrid     passkey transport. An attacker within Bluetooth range could have used this to trick the user into using     their passkey to log the attacker's computer into the target account. (CVE-2024-9956)

  - On Windows, a compromised content process could use bad StreamData sent over AudioIPC to trigger a use-     after-free in the Browser process. This could have led to a sandbox escape. (CVE-2025-1930)

  - Android apps can load web pages using the Custom Tabs feature. This feature supports a transition     animation that could have been used to trick a user into granting sensitive permissions by hiding what the     user was actually clicking. (CVE-2025-1939)

  - It was possible to cause a use-after-free in the content process side of a WebTransport connection,     leading to a potentially exploitable crash. (CVE-2025-1931)

  - An inconsistent comparator in xslt/txNodeSorter could have resulted in potentially exploitable out-of-     bounds access. Only affected version 122 and later. (CVE-2025-1932)

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
245636	Linux Distros Unpatched Vulnerability : CVE-2025-1943	Nessus	Misc.	high
235705	GLSA-202505-02 : Mozilla Firefox: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	critical
233857	FreeBSD : mozilla -- memory corruption (37c368f1-10a2-11f0-8195-b42e991fc52e)	Nessus	FreeBSD Local Security Checks	high
232329	Fedora 40 : firefox (2025-100adaf12d)	Nessus	Fedora Local Security Checks	high
232205	Fedora 41 : firefox (2025-60c0e24d76)	Nessus	Fedora Local Security Checks	high
222958	Mozilla Thunderbird < 136.0	Nessus	Windows	critical
222957	Mozilla Thunderbird < 136.0	Nessus	MacOS X Local Security Checks	critical
221619	Mozilla Firefox < 136.0	Nessus	MacOS X Local Security Checks	high
221618	Mozilla Firefox < 136.0	Nessus	Windows	high

Detections

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CVE-2025-1943

high

Tenable Plugins

high

critical

high

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high

critical

critical

high

high