The remote Ubuntu 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4637-2 advisory.

    USN-4637-1 fixed vulnerabilities in Firefox. This update provides the corresponding updates for Ubuntu     16.04 LTS.



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 83.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-50 advisory, including the following:

  - Mozilla developers reported memory safety bugs present in Firefox 82. 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 < 83. (CVE-2020-26969)

  - If the Compact() method was called on an nsTArray, the array could have been reallocated without updating     other pointers, leading to a potential use-after-free and exploitable crash. This vulnerability affects     Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5. (CVE-2020-26960)

  - Mozilla developers reported memory safety bugs present in Firefox 82 and Firefox ESR 78.4. 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 < 83, Firefox ESR < 78.5, and     Thunderbird < 78.5. (CVE-2020-26968)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4637-1 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 across origins, bypass security restrictions, conduct phishing attacks, conduct     cross-site scripting (XSS) attacks, bypass Content Security Policy (CSP) restrictions, conduct DNS     rebinding 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Mozilla developers reported memory safety bugs present in Firefox 82. 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 < 83. (CVE-2020-26969)

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 83.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-50 advisory.

  - Heap buffer overflow in Freetype in Google Chrome prior to 86.0.4240.111 allowed a remote attacker to     potentially exploit heap corruption via a crafted HTML page. (CVE-2020-15999)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
143127	Ubuntu 16.04 LTS : Firefox vulnerabilities (USN-4637-2)	Nessus	Ubuntu Local Security Checks	11/20/2020	10/29/2024	high
142910	Mozilla Firefox < 83.0	Nessus	Windows	11/17/2020	2/6/2025	critical
143121	Ubuntu 18.04 LTS / 20.04 LTS : Firefox vulnerabilities (USN-4637-1)	Nessus	Ubuntu Local Security Checks	11/19/2020	8/27/2024	high
246967	Linux Distros Unpatched Vulnerability : CVE-2020-26969	Nessus	Misc.	8/9/2025	8/9/2025	high
142911	Mozilla Firefox < 83.0	Nessus	MacOS X Local Security Checks	11/17/2020	2/6/2025	critical

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