The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:1184-1 advisory.

  - Uninitialized memory in a canvas object could have caused an incorrect free() leading to memory corruption     and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91,     Firefox ESR < 78.13, and Firefox < 91. (CVE-2021-29980)

  - Instruction reordering resulted in a sequence of instructions that would cause an object to be incorrectly     considered during garbage collection. This led to memory corruption and a potentially exploitable crash.
    This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
    (CVE-2021-29984)

  - A use-after-free vulnerability in media channels could have led to memory corruption and a potentially     exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13,     and Firefox < 91. (CVE-2021-29985)

  - A suspected race condition when calling getaddrinfo led to memory corruption and a potentially exploitable     crash. *Note: This issue only affected Linux operating systems. Other operating systems are unaffected.*     This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
    (CVE-2021-29986)

  - Firefox incorrectly treated an inline list-item element as a block element, resulting in an out of bounds     read or memory corruption, and a potentially exploitable crash. This vulnerability affects Thunderbird <     78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91. (CVE-2021-29988)

  - Mozilla developers reported memory safety bugs present in Firefox 90 and Firefox ESR 78.12. 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 Thunderbird < 78.13, Firefox ESR < 78.13,     and Firefox < 91. (CVE-2021-29989)

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

The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2745 advisory.

    Multiple security issues were discovered in Thunderbird, which could result in the execution of arbitrary     code. For Debian 9 stretch, these problems have been fixed in version 1:78.13.0-1~deb9u1. We recommend     that you upgrade your thunderbird packages. For the detailed security status of thunderbird please refer     to its security tracker page at: https://security-tracker.debian.org/tracker/thunderbird Further     information about Debian LTS security advisories, how to apply these updates to your system and frequently     asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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 remote MiracleLinux 4 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2021-2374:16 advisory.

    * Mozilla: Uninitialized memory in a canvas object could have led to memory corruption (CVE-2021-29980)
      * Mozilla: Incorrect instruction reordering during JIT optimization (CVE-2021-29984)
      * Mozilla: Race condition when resolving DNS names could have led to memory corruption (CVE-2021-29986)
      * Mozilla: Memory corruption as a result of incorrect style treatment (CVE-2021-29988)
      * Mozilla: Memory safety bugs fixed in Thunderbird 78.13 (CVE-2021-29989)
      * Mozilla: Use-after-free media channels (CVE-2021-29985)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 remote MiracleLinux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2021-2370:15 advisory.

    * Mozilla: Uninitialized memory in a canvas object could have led to memory corruption (CVE-2021-29980)
      * Mozilla: Incorrect instruction reordering during JIT optimization (CVE-2021-29984)
      * Mozilla: Race condition when resolving DNS names could have led to memory corruption (CVE-2021-29986)
      * Mozilla: Memory corruption as a result of incorrect style treatment (CVE-2021-29988)
      * Mozilla: Memory safety bugs fixed in Thunderbird 78.13 (CVE-2021-29989)
      * Mozilla: Use-after-free media channels (CVE-2021-29985)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 ESR installed on the remote macOS or Mac OS X host is prior to 78.13. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-34 advisory.

  - Mozilla developers Christoph Kerschbaumer, Simon Giesecke, Sandor Molnar, and Olli Pettay reported memory     safety bugs present in Firefox 90 and Firefox ESR 78.12. 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-2021-29989)

  - A suspected race condition when calling <code>getaddrinfo</code> led to memory corruption and a     potentially exploitable crash.  Note: This issue only affected Linux operating systems. Other operating     systems are unaffected. (CVE-2021-29986)

  - Firefox incorrectly treated an inline list-item element as a block element, resulting in an out of bounds     read or memory corruption, and a potentially exploitable crash. (CVE-2021-29988)

  - Instruction reordering resulted in a sequence of instructions that would cause an object to be incorrectly     considered during garbage collection. This led to memory corruption and a potentially exploitable crash.
    (CVE-2021-29984)

  - Uninitialized memory in a canvas object could have caused an incorrect free() leading to memory corruption     and a potentially exploitable crash. (CVE-2021-29980)

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 Thunderbird installed on the remote Windows host is prior to 78.13. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-35 advisory.

  - Mozilla developers Christoph Kerschbaumer, Simon Giesecke, Sandor Molnar, and Olli Pettay reported memory     safety bugs present in Thunderbird 78.12. 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-2021-29989)

  - A suspected race condition when calling <code>getaddrinfo</code> led to memory corruption and a     potentially exploitable crash.  Note: This issue only affected Linux operating systems. Other operating     systems are unaffected. (CVE-2021-29986)

  - Thunderbird incorrectly treated an inline list-item element as a block element, resulting in an out of     bounds read or memory corruption, and a potentially exploitable crash. (CVE-2021-29988)

  - Instruction reordering resulted in a sequence of instructions that would cause an object to be incorrectly     considered during garbage collection. This led to memory corruption and a potentially exploitable crash.
    (CVE-2021-29984)

  - Uninitialized memory in a canvas object could have caused an incorrect free() leading to memory corruption     and a potentially exploitable crash. (CVE-2021-29980)

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 Thunderbird installed on the remote macOS or Mac OS X host is prior to 91.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-36 advisory.

  - Mozilla developers Kershaw Chang, Philipp, Chris Peterson, Sebastian Hengst, Christoph Kerschbaumer, Olli     Pettay, Sandor Molnar, and Simon Giesecke reported memory safety bugs present in versions of Thunderbird     prior to 91. 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-2021-29989)

  - A suspected race condition when calling <code>getaddrinfo</code> led to memory corruption and a     potentially exploitable crash.  Note: This issue only affected Linux operating systems. Other operating     systems are unaffected. (CVE-2021-29986)

  - An issue present in lowering/register allocation could have led to obscure but deterministic register     confusion failures in JITted code that would lead to a potentially exploitable crash. (CVE-2021-29981)

  - Thunderbird incorrectly treated an inline list-item element as a block element, resulting in an out of     bounds read or memory corruption, and a potentially exploitable crash. (CVE-2021-29988)

  - Instruction reordering resulted in a sequence of instructions that would cause an object to be incorrectly     considered during garbage collection. This led to memory corruption and a potentially exploitable crash.
    (CVE-2021-29984)

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 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5037-1 advisory.

    Multiple security issues were discovered in Firefox. If a user were tricked into opening a specially     crafted website, an attacker could potentially exploit these to cause a denial of service, obtain     sensitive information, trick a user into accepting unwanted permissions, 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 remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-4959 advisory.

    Multiple security issues were discovered in Thunderbird, which could result in the execution of arbitrary     code. For the stable distribution (bullseye), these problems have been fixed in version     1:78.13.0-1~deb11u1. For the oldstable distribution (buster), these problems have been fixed in version     1:78.13.0-1~deb10u1. We recommend that you upgrade your thunderbird packages. For the detailed security     status of thunderbird please refer to its security tracker page at: https://security-     tracker.debian.org/tracker/thunderbird

Tenable has extracted the preceding description block directly from the Debian 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 remote Redhat Enterprise Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:3154 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    This update upgrades Firefox to version 78.13.0 ESR.

    Security Fix(es):

    * Mozilla: Uninitialized memory in a canvas object could have led to memory corruption (CVE-2021-29980)

    * Mozilla: Incorrect instruction reordering during JIT optimization (CVE-2021-29984)

    * Mozilla: Race condition when resolving DNS names could have led to memory corruption (CVE-2021-29986)

    * Mozilla: Memory corruption as a result of incorrect style treatment (CVE-2021-29988)

    * Mozilla: Memory safety bugs fixed in Thunderbird 78.13 (CVE-2021-29989)

    * Mozilla: Use-after-free media channels (CVE-2021-29985)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 remote SUSE Linux SLED15 / SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:2774-1 advisory.

  - Uninitialized memory in a canvas object could have caused an incorrect free() leading to memory corruption     and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91,     Firefox ESR < 78.13, and Firefox < 91. (CVE-2021-29980)

  - Instruction reordering resulted in a sequence of instructions that would cause an object to be incorrectly     considered during garbage collection. This led to memory corruption and a potentially exploitable crash.
    This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
    (CVE-2021-29984)

  - A use-after-free vulnerability in media channels could have led to memory corruption and a potentially     exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13,     and Firefox < 91. (CVE-2021-29985)

  - A suspected race condition when calling getaddrinfo led to memory corruption and a potentially exploitable     crash. *Note: This issue only affected Linux operating systems. Other operating systems are unaffected.*     This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
    (CVE-2021-29986)

  - Firefox incorrectly treated an inline list-item element as a block element, resulting in an out of bounds     read or memory corruption, and a potentially exploitable crash. This vulnerability affects Thunderbird <     78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91. (CVE-2021-29988)

  - Mozilla developers reported memory safety bugs present in Firefox 90 and Firefox ESR 78.12. 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 Thunderbird < 78.13, Firefox ESR < 78.13,     and Firefox < 91. (CVE-2021-29989)

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 90 and Firefox ESR 78.12. 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 Thunderbird < 78.13, Firefox ESR < 78.13,     and Firefox < 91. (CVE-2021-29989)

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

ID	Name	Product	Family	Published	Updated	Severity
152769	openSUSE 15 Security Update : MozillaFirefox (openSUSE-SU-2021:1184-1)	Nessus	SuSE Local Security Checks	8/24/2021	12/4/2023	high
153132	Debian DLA-2745-1 : thunderbird - LTS security update	Nessus	Debian Local Security Checks	9/8/2021	1/24/2025	high
293826	MiracleLinux 4 : thunderbird-78.13.0-1.0.1.AXS4 (AXSA:2021-2374:16)	Nessus	Miracle Linux Local Security Checks	1/20/2026	1/20/2026	high
293912	MiracleLinux 8 : thunderbird-78.13.0-1.el8.ML.1 (AXSA:2021-2370:15)	Nessus	Miracle Linux Local Security Checks	1/20/2026	1/20/2026	high
152415	Mozilla Firefox ESR < 78.13	Nessus	MacOS X Local Security Checks	8/10/2021	11/18/2025	high
152452	Mozilla Thunderbird < 78.13	Nessus	Windows	8/11/2021	11/18/2025	high
152504	Mozilla Thunderbird < 91.0	Nessus	MacOS X Local Security Checks	8/11/2021	11/18/2025	high
152508	Ubuntu 18.04 LTS / 20.04 LTS : Firefox vulnerabilities (USN-5037-1)	Nessus	Ubuntu Local Security Checks	8/12/2021	8/27/2024	high
152568	Debian DSA-4959-1 : thunderbird - security update	Nessus	Debian Local Security Checks	8/15/2021	1/24/2025	high
152581	RHEL 7 : firefox (RHSA-2021:3154)	Nessus	Red Hat Local Security Checks	8/16/2021	11/7/2024	high
152690	SUSE SLED15 / SLES15 Security Update : MozillaFirefox (SUSE-SU-2021:2774-1)	Nessus	SuSE Local Security Checks	8/20/2021	7/13/2023	high
247228	Linux Distros Unpatched Vulnerability : CVE-2021-29989	Nessus	Misc.	8/10/2025	8/10/2025	high

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