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

  - Mozilla developers reported memory safety bugs present in Firefox 76. 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 < 77. (CVE-2020-12411)

  - NSS has shown timing differences when performing DSA signatures, which was exploitable and could
    eventually leak private keys. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox
    ESR < 68.9. (CVE-2020-12399)

  - When browsing a malicious page, a race condition in our SharedWorkerService could occur and lead to a
    potentially exploitable crash. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox
    ESR < 68.9. (CVE-2020-12405)

  - Mozilla Developer Iain Ireland discovered a missing type check during unboxed objects removal, resulting
    in a crash. We presume that with enough effort that it could be exploited to run arbitrary code. This
    vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9. (CVE-2020-12406)

  - Mozilla Developer Nicolas Silva found that when using WebRender, Firefox would under certain conditions
    leak arbitrary GPU memory to the visible screen. The leaked memory content was visible to the user, but
    not observable from web content. This vulnerability affects Firefox < 77. (CVE-2020-12407)

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 77.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-20 advisory.

  - Mozilla developers :Gijs (he/him), Randell Jesup reported memory safety bugs present in Firefox 76. 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-2020-12411)

  - NSS has shown timing differences when performing DSA signatures, which was exploitable and could     eventually leak private keys. (CVE-2020-12399)

  - When browsing a malicious page, a race condition in our SharedWorkerService could occur and lead to a     potentially exploitable crash. (CVE-2020-12405)

  - Mozilla Developer Iain Ireland discovered a missing type check during unboxed objects removal, resulting     in a crash. We presume that with enough effort that it could be exploited to run arbitrary code.
    (CVE-2020-12406)

  - Mozilla Developer Nicolas Silva found that when using WebRender, Firefox would under certain conditions     leak arbitrary GPU memory to the visible screen. The leaked memory content was visible to the user, but     not observable from web content. (CVE-2020-12407)

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

The remote host is affected by the vulnerability described in GLSA-202006-07 (Mozilla Firefox: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Mozilla Firefox. Please       review the CVE identifiers referenced below for details.
  Impact :

    Please review the referenced CVE identifiers for details.
  Workaround :

    There is no known workaround at this time.

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 76. 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 < 77. (CVE-2020-12411)

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

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-4383-1 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, spoof the     addressbar, or execute arbitrary code. (CVE-2020-12405, CVE-2020-12406, CVE-2020-12407, CVE-2020-12408,     CVE-2020-12409, CVE-2020-12410, CVE-2020-12411)

    It was discovered that NSS showed timing differences when performing DSA signatures. An attacker could     potentially exploit this to obtain private keys using a timing attack. (CVE-2020-12399)

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 77.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-20 advisory.

  - Mozilla developers :Gijs (he/him), Randell Jesup reported memory safety bugs present in Firefox 76. 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-2020-12411)

  - NSS has shown timing differences when performing DSA signatures, which was exploitable and could     eventually leak private keys. (CVE-2020-12399)

  - When browsing a malicious page, a race condition in our SharedWorkerService could occur and lead to a     potentially exploitable crash. (CVE-2020-12405)

  - Mozilla Developer Iain Ireland discovered a missing type check during unboxed objects removal, resulting     in a crash. We presume that with enough effort that it could be exploited to run arbitrary code.
    (CVE-2020-12406)

  - Mozilla Developer Nicolas Silva found that when using WebRender, Firefox would under certain conditions     leak arbitrary GPU memory to the visible screen. The leaked memory content was visible to the user, but     not observable from web content. (CVE-2020-12407)

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
404368	Alpine: multiple firefox packages: security update to 77.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	high
426035	Alpine: multiple librewolf packages: security update to 77.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	5/16/2025	7/2/2026	high
426035	Alpine: multiple librewolf packages: security update to 77.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	5/16/2025	7/2/2026	high
404368	Alpine: multiple firefox packages: security update to 77.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	high
137048	Mozilla Firefox < 77.0	Nessus	MacOS X Local Security Checks	6/2/2020	11/18/2025	high
137444	GLSA-202006-07 : Mozilla Firefox: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	6/17/2020	3/7/2024	high
245065	Linux Distros Unpatched Vulnerability : CVE-2020-12411	Nessus	Misc.	8/7/2025	7/28/2026	high
137179	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Firefox vulnerabilities (USN-4383-1)	Nessus	Ubuntu Local Security Checks	6/5/2020	8/27/2024	high
137049	Mozilla Firefox < 77.0	Nessus	Windows	6/2/2020	11/18/2025	high

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