There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type
    confusion. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects
    Firefox ESR < 68.4.1, Thunderbird < 68.4.1, and Firefox < 72.0.1. (CVE-2019-17026)

  - When pasting a &lt;style&gt; tag from the clipboard into a rich text editor, the CSS sanitizer incorrectly
    rewrites a @namespace rule. This could allow for injection into certain types of websites resulting in
    data exfiltration. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72. (CVE-2019-17016)

  - Due to a missing case handling object types, a type confusion vulnerability could occur, resulting in a
    crash. We presume that with enough effort that it could be exploited to run arbitrary code. This
    vulnerability affects Firefox ESR < 68.4 and Firefox < 72. (CVE-2019-17017)

  - If an XML file is served with a Content Security Policy and the XML file includes an XSL stylesheet, the
    Content Security Policy will not be applied to the contents of the XSL stylesheet. If the XSL sheet e.g.
    includes JavaScript, it would bypass any of the restrictions of the Content Security Policy applied to the
    XML document. This vulnerability affects Firefox < 72. (CVE-2019-17020)

  - When pasting a &lt;style&gt; tag from the clipboard into a rich text editor, the CSS sanitizer does not
    escape &lt; and &gt; characters. Because the resulting string is pasted directly into the text node of the
    element this does not result in a direct injection into the webpage; however, if a webpage subsequently
    copies the node's innerHTML, assigning it to another innerHTML, this would result in an XSS vulnerability.
    Two WYSIWYG editors were identified with this behavior, more may exist. This vulnerability affects Firefox
    ESR < 68.4 and Firefox < 72. (CVE-2019-17022)

The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4234-1 advisory.

    Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially     crafted website, an attacker could potentially exploit these to cause a denial of service, obtain     sensitive information, bypass Content Security Policy (CSP) restrictions, conduct cross-site scripting     (XSS) attacks, 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 version of Firefox installed on the remote Windows host is prior to 72.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-01 advisory.

  - Mozilla developers Karl Tomlinson, Jason Kratzer, Tyson Smith, Jon Coppeard, and Christian Holler reported     memory safety bugs present in Firefox 71. 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-2019-17025)

  - During the initialization of a new content process, a pointer offset can be manipulated leading to memory     corruption and a potentially exploitable crash in the parent process.  Note: this issue only occurs on     Windows. Other operating systems are unaffected. (CVE-2019-17015)

  - When pasting a <code><style></code> tag from the clipboard into a rich text editor, the CSS     sanitizer incorrectly rewrites a @namespace rule. This could allow for injection into certain types of     websites resulting in data exfiltration. (CVE-2019-17016)

  - Due to a missing case handling object types, a type confusion vulnerability could occur, resulting in a     crash. We presume that with enough effort that it could be exploited to run arbitrary code.
    (CVE-2019-17017)

  - When in Private Browsing Mode on Windows 10, the Windows keyboard may retain word suggestions to improve     the accuracy of the keyboard. (CVE-2019-17018)

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 72.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-01 advisory.

  - Mozilla developers Karl Tomlinson, Jason Kratzer, Tyson Smith, Jon Coppeard, and Christian Holler reported     memory safety bugs present in Firefox 71. 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-2019-17025)

  - During the initialization of a new content process, a pointer offset can be manipulated leading to memory     corruption and a potentially exploitable crash in the parent process.  Note: this issue only occurs on     Windows. Other operating systems are unaffected. (CVE-2019-17015)

  - When pasting a <code><style></code> tag from the clipboard into a rich text editor, the CSS     sanitizer incorrectly rewrites a @namespace rule. This could allow for injection into certain types of     websites resulting in data exfiltration. (CVE-2019-17016)

  - Due to a missing case handling object types, a type confusion vulnerability could occur, resulting in a     crash. We presume that with enough effort that it could be exploited to run arbitrary code.
    (CVE-2019-17017)

  - When in Private Browsing Mode on Windows 10, the Windows keyboard may retain word suggestions to improve     the accuracy of the keyboard. (CVE-2019-17018)

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.

  - If an XML file is served with a Content Security Policy and the XML file includes an XSL stylesheet, the     Content Security Policy will not be applied to the contents of the XSL stylesheet. If the XSL sheet e.g.
    includes JavaScript, it would bypass any of the restrictions of the Content Security Policy applied to the     XML document. This vulnerability affects Firefox < 72. (CVE-2019-17020)

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

ID	Name	Product	Family	Published	Updated	Severity
404363	Alpine: multiple firefox packages: security update to 71.0.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	high
426477	Alpine: multiple librewolf packages: security update to 71.0.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	5/16/2025	7/2/2026	high
404363	Alpine: multiple firefox packages: security update to 71.0.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	high
426477	Alpine: multiple librewolf packages: security update to 71.0.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	5/16/2025	7/2/2026	high
132854	Ubuntu 16.04 LTS / 18.04 LTS : Firefox vulnerabilities (USN-4234-1)	Nessus	Ubuntu Local Security Checks	1/13/2020	8/27/2024	high
132709	Mozilla Firefox < 72.0	Nessus	Windows	1/8/2020	11/18/2025	high
132708	Mozilla Firefox < 72.0	Nessus	MacOS X Local Security Checks	1/8/2020	11/18/2025	high
248677	Linux Distros Unpatched Vulnerability : CVE-2019-17020	Nessus	Misc.	8/12/2025	7/28/2026	medium

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