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

  - Mozilla developers Tyson Smith, Bob Clary, and Alexandru Michis reported memory safety bugs present in
    Firefox 74. 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 < 75.
    (CVE-2020-6826)

  - When reading from areas partially or fully outside the source resource with WebGL's
    <code>copyTexSubImage</code> method, the specification requires the returned values be zero. Previously,
    this memory was uninitialized, leading to potentially sensitive data disclosure. This vulnerability
    affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75. (CVE-2020-6821)

  - On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in
    <code>GMPDecodeData</code>. It is possible that with enough effort this could have been exploited to run
    arbitrary code. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.
    (CVE-2020-6822)

  - A malicious extension could have called <code>browser.identity.launchWebAuthFlow</code>, controlling the
    redirect_uri, and through the Promise returned, obtain the Auth code and gain access to the user's account
    at the service provider. This vulnerability affects Firefox < 75. (CVE-2020-6823)

  - Initially, a user opens a Private Browsing Window and generates a password for a site, then closes the
    Private Browsing Window but leaves Firefox open. Subsequently, if the user had opened a new Private
    Browsing Window, revisited the same site, and generated a new password - the generated passwords would
    have been identical, rather than independent. This vulnerability affects Firefox < 75. (CVE-2020-6824)

The version of Firefox installed on the remote Windows host is prior to 75.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-12 advisory.

  - Mozilla developers Tyson Smith, Bob Clary, and Alexandru Michis reported memory safety bugs present in     Firefox 74. 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-2020-6826)

  - When reading from areas partially or fully outside the source resource with WebGL's     <code>copyTexSubImage</code> method, the specification requires the returned values be zero. Previously,     this memory was uninitialized, leading to potentially sensitive data disclosure. (CVE-2020-6821)

  - On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in     <code>GMPDecodeData</code>. It is possible that with enough effort this could have been exploited to run     arbitrary code. (CVE-2020-6822)

  - A malicious extension could have called <code>browser.identity.launchWebAuthFlow</code>, controlling the     redirecturi, and through the Promise returned, obtain the Auth code and gain access to the user's account     at the service provider. (CVE-2020-6823)

  - Initially, a user opens a Private Browsing Window and generates a password for a site, then closes the     Private Browsing Window but leaves Firefox open. Subsequently, if the user had opened a new Private     Browsing Window, revisited the same site, and generated a new password - the generated passwords would     have been identical, rather than independent. (CVE-2020-6824)

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-4323-1 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, or execute arbitrary code. (CVE-2020-6821, CVE-2020-6822, CVE-2020-6824,     CVE-2020-6825, CVE-2020-6826)

    It was discovered that extensions could obtain auth codes from OAuth login flows in some circumstances. If     a user were tricked in to installing a specially crafted extension, an attacker could potentially exploit     this to obtain access to the user's account. (CVE-2020-6823)

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.

  - Initially, a user opens a Private Browsing Window and generates a password for a site, then closes the     Private Browsing Window but leaves Firefox open. Subsequently, if the user had opened a new Private     Browsing Window, revisited the same site, and generated a new password - the generated passwords would     have been identical, rather than independent. This vulnerability affects Firefox < 75. (CVE-2020-6824)

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

The remote host is affected by the vulnerability described in GLSA-202004-11 (Mozilla Firefox: Multiple vulnerabilities)

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

    A remote attacker could entice a user to view a specially crafted web       page, possibly resulting in the execution of arbitrary code with the       privileges of the process, an information leak or a Denial of Service       condition.
  Workaround :

    There is no known workaround at this time.

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 75.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-12 advisory.

  - Mozilla developers Tyson Smith, Bob Clary, and Alexandru Michis reported memory safety bugs present in     Firefox 74. 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-2020-6826)

  - When reading from areas partially or fully outside the source resource with WebGL's     <code>copyTexSubImage</code> method, the specification requires the returned values be zero. Previously,     this memory was uninitialized, leading to potentially sensitive data disclosure. (CVE-2020-6821)

  - On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in     <code>GMPDecodeData</code>. It is possible that with enough effort this could have been exploited to run     arbitrary code. (CVE-2020-6822)

  - A malicious extension could have called <code>browser.identity.launchWebAuthFlow</code>, controlling the     redirecturi, and through the Promise returned, obtain the Auth code and gain access to the user's account     at the service provider. (CVE-2020-6823)

  - Initially, a user opens a Private Browsing Window and generates a password for a site, then closes the     Private Browsing Window but leaves Firefox open. Subsequently, if the user had opened a new Private     Browsing Window, revisited the same site, and generated a new password - the generated passwords would     have been identical, rather than independent. (CVE-2020-6824)

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
426198	Alpine: multiple librewolf packages: security update to 75.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	5/16/2025	7/2/2026	critical
426198	Alpine: multiple librewolf packages: security update to 75.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	5/16/2025	7/2/2026	critical
404366	Alpine: multiple firefox packages: security update to 75.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	critical
404366	Alpine: multiple firefox packages: security update to 75.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	critical
135276	Mozilla Firefox < 75.0	Nessus	Windows	4/7/2020	11/18/2025	critical
135284	Ubuntu 16.04 LTS / 18.04 LTS : Firefox vulnerabilities (USN-4323-1)	Nessus	Ubuntu Local Security Checks	4/8/2020	8/27/2024	critical
230222	Linux Distros Unpatched Vulnerability : CVE-2020-6824	Nessus	Misc.	3/5/2025	7/28/2026	low
135947	GLSA-202004-11 : Mozilla Firefox: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	4/24/2020	3/14/2024	critical
135275	Mozilla Firefox < 75.0	Nessus	MacOS X Local Security Checks	4/7/2020	11/18/2025	critical

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