The version of Thunderbird installed on the remote Windows host is prior to 135.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-11 advisory.

  - Memory safety bugs present in Firefox 134 and Thunderbird 134. 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-2025-1020)

  - An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable     crash. (CVE-2025-1009)

  - An attacker could have caused a use-after-free via the Custom Highlight API, leading to a potentially     exploitable crash. (CVE-2025-1010)

  - The fullscreen notification is prematurely hidden when fullscreen is re-requested quickly by the user.
    This could have been leveraged to perform a potential spoofing attack. (CVE-2025-1018)

  - A bug in WebAssembly code generation could have lead to a crash. It may have been possible for an attacker     to leverage this to achieve code execution. (CVE-2025-1011)

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 135.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-07 advisory.

  - Memory safety bugs present in Firefox 134 and Thunderbird 134. 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-2025-1020)

  - An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable     crash. (CVE-2025-1009)

  - An attacker could have caused a use-after-free via the Custom Highlight API, leading to a potentially     exploitable crash. (CVE-2025-1010)

  - The fullscreen notification is prematurely hidden when fullscreen is re-requested quickly by the user.
    This could have been leveraged to perform a potential spoofing attack. (CVE-2025-1018)

  - A bug in WebAssembly code generation could have lead to a crash. It may have been possible for an attacker     to leverage this to achieve code execution. (CVE-2025-1011)

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 128.7. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-09 advisory.

  - Memory safety bugs present in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6. 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-2025-1017)

  - An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable     crash. (CVE-2025-1009)

  - An attacker could have caused a use-after-free via the Custom Highlight API, leading to a potentially     exploitable crash. (CVE-2025-1010)

  - A bug in WebAssembly code generation could have lead to a crash. It may have been possible for an attacker     to leverage this to achieve code execution. (CVE-2025-1011)

  - A race during concurrent delazification could have led to a use-after-free. (CVE-2025-1012)

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 135.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-07 advisory.

  - Memory safety bugs present in Firefox 134 and Thunderbird 134. 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-2025-1020)

  - An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable     crash. (CVE-2025-1009)

  - An attacker could have caused a use-after-free via the Custom Highlight API, leading to a potentially     exploitable crash. (CVE-2025-1010)

  - The fullscreen notification is prematurely hidden when fullscreen is re-requested quickly by the user.
    This could have been leveraged to perform a potential spoofing attack. (CVE-2025-1018)

  - A bug in WebAssembly code generation could have lead to a crash. It may have been possible for an attacker     to leverage this to achieve code execution. (CVE-2025-1011)

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 mozilla-thunderbird installed on the remote host is prior to 128.7.0esr. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2025-036-03 advisory.

    New mozilla-thunderbird packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the mozilla-thunderbird 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 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2025:1292 advisory.

    Mozilla Thunderbird is a standalone mail and newsgroup client.

    Security Fix(es):

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and     Thunderbird 128.7 (CVE-2025-1017)

    * firefox: thunderbird: Use-after-free in Custom Highlight (CVE-2025-1010)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 115.20,     Firefox ESR 128.7, Thunderbird 115.20, and Thunderbird 128.7 (CVE-2025-1016)

    * firefox: thunderbird: Potential opening of private browsing tabs in normal browsing windows     (CVE-2025-1013)

    * firefox: thunderbird: A bug in WebAssembly code generation could result in a crash (CVE-2025-1011)

    * thunderbird: Unsanitized address book fields (CVE-2025-1015)

    * firefox: thunderbird: Use-after-free in XSLT (CVE-2025-1009)

    * thunderbird: Address of e-mail sender can be spoofed by malicious email (CVE-2025-0510)

    * firefox: thunderbird: Certificate length was not properly checked (CVE-2025-1014)

    * firefox: thunderbird: Use-after-free during concurrent delazification (CVE-2025-1012)

    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 Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2025:1317 advisory.

    Mozilla Thunderbird is a standalone mail and newsgroup client.

    Security Fix(es):

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and     Thunderbird 128.7 (CVE-2025-1017)

    * firefox: thunderbird: Use-after-free in Custom Highlight (CVE-2025-1010)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 115.20,     Firefox ESR 128.7, Thunderbird 115.20, and Thunderbird 128.7 (CVE-2025-1016)

    * firefox: thunderbird: Potential opening of private browsing tabs in normal browsing windows     (CVE-2025-1013)

    * firefox: thunderbird: A bug in WebAssembly code generation could result in a crash (CVE-2025-1011)

    * thunderbird: Unsanitized address book fields (CVE-2025-1015)

    * firefox: thunderbird: Use-after-free in XSLT (CVE-2025-1009)

    * thunderbird: Address of e-mail sender can be spoofed by malicious email (CVE-2025-0510)

    * firefox: thunderbird: Certificate length was not properly checked (CVE-2025-1014)

    * firefox: thunderbird: Use-after-free during concurrent delazification (CVE-2025-1012)

    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 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:0405-1 advisory.

    Update to Mozilla Thunderbird 128.7 (MFSA 2025-10, bsc#1236539).

    Security fixes:

      - CVE-2025-1009: use-after-free in XSLT.
      - CVE-2025-1010: use-after-free in Custom Highlight.
      - CVE-2025-1011: a bug in WebAssembly code generation could result in a crash.
      - CVE-2025-1012: use-after-free during concurrent delazification.
      - CVE-2024-11704: potential double-free vulnerability in PKCS#7 decryption handling.
      - CVE-2025-1013: potential opening of private browsing tabs in normal browsing windows.
      - CVE-2025-1014: certificate length was not properly checked.
      - CVE-2025-1015: unsanitized address book fields.
      - CVE-2025-0510: address of e-mail sender can be spoofed by malicious email.
      - CVE-2025-1016: memory safety bugs.
      - CVE-2025-1017: memory safety bugs.

    Other fixes:

      - fixed: images inside links could zoom when clicked instead of opening the link.
      - fixed: compacting an empty folder failed with write error.
      - fixed: compacting of IMAP folder with corrupted local storage failed with write error.
      - fixed: after restart, all restored tabs with opened PDFs showed the same attachment.
      - fixed: exceptions during CalDAV item processing would halt subsequent item handling.
      - fixed: context menu was unable to move email address to a different field.
      - fixed: link at about:rights pointed to Firefox privacy policy instead of Thunderbird's.
      - fixed: POP3 'fetch headers only' and 'get selected messages' could delete messages.
      - fixed: 'Search Online' checkbox in saved search properties was incorrectly disabled.
      - fixed: POP3 status message showed incorrect download count when messages were deleted.
      - fixed: space bar did not always advance to the next unread message.
      - fixed: folder creation or renaming failed due to incorrect preference settings.
      - fixed: forwarding/editing S/MIME drafts/templates unusable due to regression (bsc#1236411).
      - fixed: sort order in 'Search Messages' panel reset after search or on first launch.
      - fixed: reply window added an unnecessary third blank line at the top.
      - fixed: Thunderbird spell check box did not allow ENTER to accept suggested changes.
      - fixed: long email subject lines could overlap window control buttons on macOS.
      - fixed: flathub manifest link was not correct.
      - fixed: 'Prefer client-side email scheduling' needed to be selected twice.
      - fixed: duplicate invitations were sent if CALDAV calendar email case did not match.
      - fixed: visual and UX improvements.

Tenable has extracted the preceding description block directly from the SUSE 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 Ubuntu 22.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7663-1 advisory.

    Multiple security issues were discovered in Thunderbird. If a user were tricked into opening a specially     crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of     service, obtain sensitive information, bypass security restrictions, cross-site tracing, 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
214955	Mozilla Thunderbird < 135.0	Nessus	Windows	2/4/2025	11/18/2025	critical
214964	Mozilla Firefox < 135.0	Nessus	MacOS X Local Security Checks	2/4/2025	11/18/2025	critical
214956	Mozilla Firefox ESR < 128.7	Nessus	MacOS X Local Security Checks	2/4/2025	11/18/2025	critical
214965	Mozilla Firefox < 135.0	Nessus	Windows	2/4/2025	11/18/2025	critical
215044	Slackware Linux 15.0 / current mozilla-thunderbird Multiple Vulnerabilities (SSA:2025-036-03)	Nessus	Slackware Local Security Checks	2/5/2025	2/7/2025	critical
216064	RHEL 8 : thunderbird (RHSA-2025:1292)	Nessus	Red Hat Local Security Checks	2/11/2025	6/5/2025	critical
216120	RHEL 9 : thunderbird (RHSA-2025:1317)	Nessus	Red Hat Local Security Checks	2/11/2025	6/5/2025	critical
216192	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : MozillaThunderbird (SUSE-SU-2025:0405-1)	Nessus	SuSE Local Security Checks	2/12/2025	2/12/2025	critical
242691	Ubuntu 22.04 LTS : Thunderbird vulnerabilities (USN-7663-1)	Nessus	Ubuntu Local Security Checks	7/25/2025	7/25/2025	critical

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