The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - If upgrade-insecure-requests was specified in the Content Security Policy, and a link was dragged and     dropped from that page, the link was not upgraded to https. This vulnerability affects Firefox < 70.
    (CVE-2019-17002)

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

The version of Firefox installed on the remote Windows host is prior to 70.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2019-34 advisory.

  - Mozilla developers and community members Bob Clary, Jason Kratzer, Aaron Klotz, Iain Ireland, Tyson Smith,     Christian Holler, Steve Fink, Honza Bambas, Byron Campen, and Cristian Brindusan reported memory safety     bugs present in Firefox 69 and Firefox ESR 68.1. Some of these bugs showed evidence of memory corruption     and we presume that with enough effort some of these could be exploited to run arbitrary code.
    (CVE-2019-11764)

  - A compromised child process could have injected XBL Bindings into privileged CSS rules, resulting in     arbitrary code execution and a sandbox escape. (CVE-2019-25136)

  - Incorrect derivation of a packet length in WebRTC caused heap corruption via a crafted video file. This     resulted in a potentially exploitable crash. (CVE-2018-6156)

  - In libexpat before 2.2.8, crafted XML input could fool the parser into changing from DTD parsing to     document parsing too early. A subsequent call to <code>XMLGetCurrentLineNumber</code> or     <code>XMLGetCurrentColumnNumber</code> then resulted in a heap-based buffer over-read. (CVE-2019-15903)

  - When storing a value in IndexedDB, the value's prototype chain is followed and it was possible to retain a     reference to a locale, delete it, and subsequently reference it. This resulted in a use-after-free and a     potentially exploitable crash. (CVE-2019-11757)

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 70.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2019-34 advisory.

  - Mozilla developers and community members Bob Clary, Jason Kratzer, Aaron Klotz, Iain Ireland, Tyson Smith,     Christian Holler, Steve Fink, Honza Bambas, Byron Campen, and Cristian Brindusan reported memory safety     bugs present in Firefox 69 and Firefox ESR 68.1. Some of these bugs showed evidence of memory corruption     and we presume that with enough effort some of these could be exploited to run arbitrary code.
    (CVE-2019-11764)

  - A compromised child process could have injected XBL Bindings into privileged CSS rules, resulting in     arbitrary code execution and a sandbox escape. (CVE-2019-25136)

  - Incorrect derivation of a packet length in WebRTC caused heap corruption via a crafted video file. This     resulted in a potentially exploitable crash. (CVE-2018-6156)

  - In libexpat before 2.2.8, crafted XML input could fool the parser into changing from DTD parsing to     document parsing too early. A subsequent call to <code>XMLGetCurrentLineNumber</code> or     <code>XMLGetCurrentColumnNumber</code> then resulted in a heap-based buffer over-read. (CVE-2019-15903)

  - When storing a value in IndexedDB, the value's prototype chain is followed and it was possible to retain a     reference to a locale, delete it, and subsequently reference it. This resulted in a use-after-free and a     potentially exploitable crash. (CVE-2019-11757)

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 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4165-1 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, bypass security     restrictions, bypass same-origin restrictions, conduct cross-site scripting (XSS) attacks, bypass content     security policy (CSP) protections, 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.

ID	Name	Product	Family	Published	Updated	Severity
243366	Linux Distros Unpatched Vulnerability : CVE-2019-17002	Nessus	Misc.	8/4/2025	8/4/2025	medium
130170	Mozilla Firefox < 70.0	Nessus	Windows	10/24/2019	11/18/2025	critical
130169	Mozilla Firefox < 70.0	Nessus	MacOS X Local Security Checks	10/24/2019	11/18/2025	critical
130200	Ubuntu 16.04 LTS / 18.04 LTS : Firefox vulnerabilities (USN-4165-1)	Nessus	Ubuntu Local Security Checks	10/24/2019	8/27/2024	high

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critical

high