The Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2021_3838 advisory.

    * Mozilla: Use-after-free in MessageTask (CVE-2021-38496)

    * Mozilla: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and Firefox ESR 91.2     (CVE-2021-38500)

    * Mozilla: Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2 (CVE-2021-38501)

    * Mozilla: Downgrade attack on SMTP STARTTLS connections (CVE-2021-38502)

    * rust-crossbeam-deque: race condition may lead to double free (CVE-2021-32810)

    * Mozilla: Validation message could have been overlaid on another origin (CVE-2021-38497)

    * Mozilla: Use-after-free of nsLanguageAtomService object (CVE-2021-38498)

Tenable has extracted the preceding description block directly from the CIQ 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 10 / 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5034 advisory.

    Multiple security issues were discovered in Thunderbird, which could result in the execution of arbitrary     code, spoofing, information disclosure, downgrade attacks on SMTP STARTTLS connections or misleading     display of OpenPGP/MIME signatures. For the oldstable distribution (buster), these problems have been     fixed in version 1:91.4.1-1~deb10u1. For the stable distribution (bullseye), these problems have been     fixed in version 1:91.4.1-1~deb11u1. 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 version of Firefox ESR installed on the remote Windows host is prior to 78.15. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-44 advisory.

  - Mozilla developers and community members Andreas Pehrson and Christian Holler reported memory safety bugs     present in Firefox 92 and Firefox ESR 91.1. 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-2021-38500)

  - During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in     memory corruption and a potentially exploitable crash. (CVE-2021-38496)

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 91.2. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-47 advisory.

  - Mozilla developers and community members Kevin Brosnan, Mihai Alexandru Michis, and Christian Holler     reported memory safety bugs present in Thunderbird 91.1. 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-2021-38501)

  - In the crossbeam crate, one or more tasks in the worker queue could have been be popped twice instead of     other tasks that are forgotten and never popped. If tasks are allocated on the heap, this could have     caused a double free and a memory leak. (CVE-2021-32810)

  - Thunderbird ignored the configuration to require STARTTLS security for an SMTP connection. A MITM could     perform a downgrade attack to intercept transmitted messages, or could take control of the authenticated     session to execute SMTP commands chosen by the MITM. If an unprotected authentication method was     configured, the MITM could obtain the authentication credentials, too. (CVE-2021-38502)

  - During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in     memory corruption and a potentially exploitable crash. (CVE-2021-38496)

  - Through use of <code>reportValidity()</code> and <code>window.open()</code>, a plain-text validation     message could have been overlaid on another origin, leading to possible user confusion and spoofing     attacks. (CVE-2021-38497)

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 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:3839 advisory.

    Mozilla Thunderbird is a standalone mail and newsgroup client.

    This update upgrades Thunderbird to version 91.2.0.

    Security Fix(es):

    * Mozilla: Use-after-free in MessageTask (CVE-2021-38496)

    * Mozilla: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and Firefox ESR 91.2     (CVE-2021-38500)

    * Mozilla: Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2 (CVE-2021-38501)

    * Mozilla: Downgrade attack on SMTP STARTTLS connections (CVE-2021-38502)

    * rust-crossbeam-deque: race condition may lead to double free (CVE-2021-32810)

    * Mozilla: Validation message could have been overlaid on another origin (CVE-2021-38497)

    * Mozilla: Use-after-free of nsLanguageAtomService object (CVE-2021-38498)

    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 SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:1367-1 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)

  - 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. This vulnerability     affects Firefox < 91 and Thunderbird < 91. (CVE-2021-29981)

  - Due to incorrect JIT optimization, we incorrectly interpreted data from the wrong type of object,     resulting in the potential leak of a single bit of memory. This vulnerability affects Firefox < 91 and     Thunderbird < 91. (CVE-2021-29982)

  - Firefox for Android could get stuck in fullscreen mode and not exit it even after normal interactions that     should cause it to exit. *Note: This issue only affected Firefox for Android. Other operating systems are     unaffected.*. This vulnerability affects Firefox < 91. (CVE-2021-29983)

  - 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)

  - After requesting multiple permissions, and closing the first permission panel, subsequent permission     panels will be displayed in a different position but still record a click in the default location, making     it possible to trick a user into accepting a permission they did not want to. *This bug only affects     Firefox on Linux. Other operating systems are unaffected.*. This vulnerability affects Firefox < 91 and     Thunderbird < 91. (CVE-2021-29987)

  - 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)

  - Mozilla developers and community members reported memory safety bugs present in Firefox 90. 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 < 91. (CVE-2021-29990)

  - Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers. This     allowed for a header splitting attack against servers using HTTP/3.  (CVE-2021-29991)

  - crossbeam-deque is a package of work-stealing deques for building task schedulers when programming in     Rust. In versions prior to 0.7.4 and 0.8.0, the result of the race condition is that one or more tasks in     the worker queue can be popped twice instead of other tasks that are forgotten and never popped. If tasks     are allocated on the heap, this can cause double free and a memory leak. If not, this still can cause a     logical bug. Crates using `Stealer::steal`, `Stealer::steal_batch`, or `Stealer::steal_batch_and_pop` are     affected by this issue. This has been fixed in crossbeam-deque 0.8.1 and 0.7.4. (CVE-2021-32810)

  - When delegating navigations to the operating system, Firefox would accept the `mk` scheme which might     allow attackers to launch pages and execute scripts in Internet Explorer in unprivileged mode. <br>This     bug only affects Firefox for Windows. Other operating systems are unaffected.  (CVE-2021-38492)

  - Mozilla developers Tyson Smith, Christian Holler, and Gabriele Svelto reported memory safety bugs present     in Thunderbird 78.13.0. 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-2021-38495)

  - During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in     memory corruption and a potentially exploitable crash.  (CVE-2021-38496)

  - Through use of <code>reportValidity()</code> and <code>window.open()</code>, a plain-text validation     message could have been overlaid on another origin, leading to possible user confusion and spoofing     attacks.  (CVE-2021-38497)

  - During process shutdown, a document could have caused a use-after-free of a languages service object,     leading to memory corruption and a potentially exploitable crash.  (CVE-2021-38498)

  - Mozilla developers and community members Andreas Pehrson and Christian Holler reported memory safety bugs     present in Thunderbird 91.1. 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-2021-38500)

  - Mozilla developers and community members Kevin Brosnan, Mihai Alexandru Michis, and Christian Holler     reported memory safety bugs present in Thunderbird 91.1. 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-2021-38501)

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

The remote Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2021:3838 advisory.

  - Thunderbird ignored the configuration to require STARTTLS security for an SMTP connection. A MITM could     perform a downgrade attack to intercept transmitted messages, or could take control of the authenticated     session to execute SMTP commands chosen by the MITM. If an unprotected authentication method was     configured, the MITM could obtain the authentication credentials, too. This vulnerability affects     Thunderbird < 91.2. (CVE-2021-38502)

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

The remote NewStart CGSL host, running version MAIN 6.02, has firefox packages installed that are affected by multiple vulnerabilities:

  - In Expat (aka libexpat) before 2.4.5, there is an integer overflow in storeRawNames. (CVE-2022-25315)

  - It was possible to construct specific XSLT markup that would be able to bypass an iframe sandbox. This     vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5. (CVE-2021-4140)

  - crossbeam-deque is a package of work-stealing deques for building task schedulers when programming in     Rust. In versions prior to 0.7.4 and 0.8.0, the result of the race condition is that one or more tasks in     the worker queue can be popped twice instead of other tasks that are forgotten and never popped. If tasks     are allocated on the heap, this can cause double free and a memory leak. If not, this still can cause a     logical bug. Crates using `Stealer::steal`, `Stealer::steal_batch`, or `Stealer::steal_batch_and_pop` are     affected by this issue. This has been fixed in crossbeam-deque 0.8.1 and 0.7.4. (CVE-2021-32810)

  - Mozilla developers reported memory safety bugs present in Firefox 91 and Firefox ESR 78.13. 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 ESR < 78.14, Thunderbird < 78.14,     and Firefox < 92. (CVE-2021-38493)

  - During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in     memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15,     Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93. (CVE-2021-38496)

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

ID	名前	製品	ファミリー	公開日	更新日	深刻度
359019	Rocky Linux 8 [CIQ] Security Update: thunderbird / thunderbird-debuginfo / thunderbird-debugsource Multiple Vulnerabilities (crlsa-2021_3838)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/1	critical
156451	Debian DSA-5034-1 : thunderbird - security update	Nessus	Debian Local Security Checks	2022/1/3	2025/1/24	critical
153877	Mozilla Firefox ESR < 78.15	Nessus	Windows	2021/10/5	2025/11/18	high
154059	Mozilla Thunderbird < 91.2	Nessus	Windows	2021/10/13	2025/11/18	critical
154136	RHEL 8 : thunderbird (RHSA-2021:3839)	Nessus	Red Hat Local Security Checks	2021/10/14	2024/11/7	critical
154214	openSUSE 15 Security Update : MozillaFirefox (openSUSE-SU-2021:1367-1)	Nessus	SuSE Local Security Checks	2021/10/19	2025/3/6	critical
157839	Rocky Linux 8 : thunderbird (RLSA-2021:3838)	Nessus	Rocky Linux Local Security Checks	2022/2/9	2023/11/6	critical
206859	NewStart CGSL MAIN 6.02 : firefox Multiple Vulnerabilities (NS-SA-2024-0066)	Nessus	NewStart CGSL Local Security Checks	2024/9/10	2025/9/25	critical

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