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

  - When recursing through graphical layers while scrolling, an iterator may have become invalid, resulting in
    a potential use-after-free. This occurs because the function
    APZCTreeManager::ComputeClippedCompositionBounds did not follow iterator invalidation rules. This
    vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3. (CVE-2020-15678)

  - Mozilla developers reported memory safety bugs present in Firefox 80 and Firefox ESR 78.2. 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 < 81, Thunderbird < 78.3, and
    Firefox ESR < 78.3. (CVE-2020-15673)

  - Mozilla developers reported memory safety bugs present in Firefox 80. 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 < 81. (CVE-2020-15674)

  - When processing surfaces, the lifetime may outlive a persistent buffer leading to memory corruption and a
    potentially exploitable crash. This vulnerability affects Firefox < 81. (CVE-2020-15675)

  - Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove,
    resulting in JavaScript being executed after pasting attacker-controlled data into a contenteditable
    element. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.
    (CVE-2020-15676)

The version of Firefox installed on the remote Windows host is prior to 81.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-42 advisory.

  - When recursing through graphical layers while scrolling, an iterator may have become invalid, resulting in     a potential use-after-free. This occurs because the function     <code>APZCTreeManager::ComputeClippedCompositionBounds</code> did not follow iterator invalidation rules.
    (CVE-2020-15678)

  - When processing surfaces, the lifetime may outlive a persistent buffer leading to memory corruption and a     potentially exploitable crash. (CVE-2020-15675)

  - By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site     displayed in the download file dialog to show the original site (the one suffering from the open redirect)     rather than the site the file was actually downloaded from. (CVE-2020-15677)

  - Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove,     resulting in JavaScript being executed after pasting attacker-controlled data into a contenteditable     element. (CVE-2020-15676)

  - Mozilla developer Jason Kratzer reported memory safety bugs present in Firefox 80 and Firefox ESR 78.2.
    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-2020-15673)

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 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4546-1 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, conduct cross-     site scripting (XSS) attacks, spoof the site displayed in the download dialog, 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.

  - When processing surfaces, the lifetime may outlive a persistent buffer leading to memory corruption and a     potentially exploitable crash. This vulnerability affects Firefox < 81. (CVE-2020-15675)

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 81.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-42 advisory.

  - When recursing through graphical layers while scrolling, an iterator may have become invalid, resulting in     a potential use-after-free. This occurs because the function     <code>APZCTreeManager::ComputeClippedCompositionBounds</code> did not follow iterator invalidation rules.
    (CVE-2020-15678)

  - When processing surfaces, the lifetime may outlive a persistent buffer leading to memory corruption and a     potentially exploitable crash. (CVE-2020-15675)

  - By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site     displayed in the download file dialog to show the original site (the one suffering from the open redirect)     rather than the site the file was actually downloaded from. (CVE-2020-15677)

  - Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove,     resulting in JavaScript being executed after pasting attacker-controlled data into a contenteditable     element. (CVE-2020-15676)

  - Mozilla developer Jason Kratzer reported memory safety bugs present in Firefox 80 and Firefox ESR 78.2.
    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-2020-15673)

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	Published	Updated	Severity
404372	Alpine: multiple firefox packages: security update to 81.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	high
404372	Alpine: multiple firefox packages: security update to 81.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	high
426893	Alpine: multiple librewolf packages: security update to 81.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	5/16/2025	7/2/2026	high
426893	Alpine: multiple librewolf packages: security update to 81.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	5/16/2025	7/2/2026	high
140732	Mozilla Firefox < 81.0	Nessus	Windows	9/22/2020	11/18/2025	high
140925	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Firefox vulnerabilities (USN-4546-1)	Nessus	Ubuntu Local Security Checks	9/28/2020	8/29/2024	high
249492	Linux Distros Unpatched Vulnerability : CVE-2020-15675	Nessus	Misc.	8/15/2025	7/28/2026	high
140731	Mozilla Firefox < 81.0	Nessus	MacOS X Local Security Checks	9/22/2020	11/18/2025	high

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