The remote CentOS Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:1192 advisory.

  - If a Thunderbird user has previously imported Alice's OpenPGP key, and Alice has extended the validity     period of her key, but Alice's updated key has not yet been imported, an attacker may send an email     containing a crafted version of Alice's key with an invalid subkey, Thunderbird might subsequently attempt     to use the invalid subkey, and will fail to send encrypted email to Alice. This vulnerability affects     Thunderbird < 78.9.1. (CVE-2021-23991)

  - Thunderbird did not check if the user ID associated with an OpenPGP key has a valid self signature. An     attacker may create a crafted version of an OpenPGP key, by either replacing the original user ID, or by     adding another user ID. If Thunderbird imports and accepts the crafted key, the Thunderbird user may     falsely conclude that the false user ID belongs to the correspondent. This vulnerability affects     Thunderbird < 78.9.1. (CVE-2021-23992)

  - An attacker may perform a DoS attack to prevent a user from sending encrypted email to a correspondent. If     an attacker creates a crafted OpenPGP key with a subkey that has an invalid self signature, and the     Thunderbird user imports the crafted key, then Thunderbird may try to use the invalid subkey, but the RNP     library rejects it from being used, causing encryption to fail. This vulnerability affects Thunderbird <     78.9.1. (CVE-2021-23993)

  - When loading the shared library that provides the OTR protocol implementation, Thunderbird will initially     attempt to open it using a filename that isn't distributed by Thunderbird. If a computer has already been     infected with a malicious library of the alternative filename, and the malicious library has been copied     to a directory that is contained in the search path for executable libraries, then Thunderbird will load     the incorrect library. This vulnerability affects Thunderbird < 78.9.1. (CVE-2021-29949)

  - Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import     task. If the task runs into a failure, the secret key may remain in memory in its unprotected state. This     vulnerability affects Thunderbird < 78.8.1. (CVE-2021-29950)

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-2021:1854-1 advisory.

  - Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import     task. If the task runs into a failure, the secret key may remain in memory in its unprotected state. This     vulnerability affects Thunderbird < 78.8.1. (CVE-2021-29950)

  - The Mozilla Maintenance Service granted SERVICE_START access to BUILTIN|Users which, in a domain network,     grants normal remote users access to start or stop the service. This could be used to prevent the browser     update service from operating (if an attacker spammed the 'Stop' command); but also exposed attack surface     in the maintenance service. *Note: This issue only affected Windows operating systems older than Win 10     build 1709. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 78.10.1,     Firefox < 87, and Firefox ESR < 78.10.1. (CVE-2021-29951)

  - OpenPGP secret keys that were imported using Thunderbird version 78.8.1 up to version 78.10.1 were stored     unencrypted on the user's local disk. The master password protection was inactive for those keys. Version     78.10.2 will restore the protection mechanism for newly imported keys, and will automatically protect keys     that had been imported using affected Thunderbird versions. This vulnerability affects Thunderbird <     78.10.2. (CVE-2021-29956)

  - If a MIME encoded email contains an OpenPGP inline signed or encrypted message part, but also contains an     additional unprotected part, Thunderbird did not indicate that only parts of the message are protected.
    This vulnerability affects Thunderbird < 78.10.2. (CVE-2021-29957)

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-2021:1854-1 advisory.

  - Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import     task. If the task runs into a failure, the secret key may remain in memory in its unprotected state. This     vulnerability affects Thunderbird < 78.8.1. (CVE-2021-29950)

  - The Mozilla Maintenance Service granted SERVICE_START access to BUILTIN|Users which, in a domain network,     grants normal remote users access to start or stop the service. This could be used to prevent the browser     update service from operating (if an attacker spammed the 'Stop' command); but also exposed attack surface     in the maintenance service. *Note: This issue only affected Windows operating systems older than Win 10     build 1709. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 78.10.1,     Firefox < 87, and Firefox ESR < 78.10.1. (CVE-2021-29951)

  - OpenPGP secret keys that were imported using Thunderbird version 78.8.1 up to version 78.10.1 were stored     unencrypted on the user's local disk. The master password protection was inactive for those keys. Version     78.10.2 will restore the protection mechanism for newly imported keys, and will automatically protect keys     that had been imported using affected Thunderbird versions. This vulnerability affects Thunderbird <     78.10.2. (CVE-2021-29956)

  - If a MIME encoded email contains an OpenPGP inline signed or encrypted message part, but also contains an     additional unprotected part, Thunderbird did not indicate that only parts of the message are protected.
    This vulnerability affects Thunderbird < 78.10.2. (CVE-2021-29957)

Note that Nessus has not tested for this issue 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-2021:1201 advisory.

    Mozilla Thunderbird is a standalone mail and newsgroup client.

    This update upgrades Thunderbird to version 78.9.1.

    Security Fix(es):

    * Mozilla: An attacker may use Thunderbird's OpenPGP key refresh mechanism to poison an existing key     (CVE-2021-23991)

    * Mozilla: A crafted OpenPGP key with an invalid user ID could be used to confuse the user     (CVE-2021-23992)

    * Mozilla: Inability to send encrypted OpenPGP email after importing a crafted OpenPGP key     (CVE-2021-23993)

    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 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:1193 advisory.

    Mozilla Thunderbird is a standalone mail and newsgroup client.

    This update upgrades Thunderbird to version 78.9.1.

    Security Fix(es):

    * Mozilla: An attacker may use Thunderbird's OpenPGP key refresh mechanism to poison an existing key     (CVE-2021-23991)

    * Mozilla: A crafted OpenPGP key with an invalid user ID could be used to confuse the user     (CVE-2021-23992)

    * Mozilla: Inability to send encrypted OpenPGP email after importing a crafted OpenPGP key     (CVE-2021-23993)

    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 Ubuntu 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4936-1 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, or execute arbitrary code. (CVE-2021-23968, CVE-2021-23969,     CVE-2021-23973, CVE-2021-23978)

    It was discovered that Thunderbird may keep key material in memory in some circumstances. A local attacker     could potentially exploit this to obtain private keys. (CVE-2021-29950)

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 Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:1190 advisory.

    Mozilla Thunderbird is a standalone mail and newsgroup client.

    This update upgrades Thunderbird to version 78.9.1.

    Security Fix(es):

    * Mozilla: An attacker may use Thunderbird's OpenPGP key refresh mechanism to poison an existing key     (CVE-2021-23991)

    * Mozilla: A crafted OpenPGP key with an invalid user ID could be used to confuse the user     (CVE-2021-23992)

    * Mozilla: Inability to send encrypted OpenPGP email after importing a crafted OpenPGP key     (CVE-2021-23993)

    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 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:1192 advisory.

    Mozilla Thunderbird is a standalone mail and newsgroup client.

    This update upgrades Thunderbird to version 78.9.1.

    Security Fix(es):

    * Mozilla: An attacker may use Thunderbird's OpenPGP key refresh mechanism to poison an existing key     (CVE-2021-23991)

    * Mozilla: A crafted OpenPGP key with an invalid user ID could be used to confuse the user     (CVE-2021-23992)

    * Mozilla: Inability to send encrypted OpenPGP email after importing a crafted OpenPGP key     (CVE-2021-23993)

    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 version of Thunderbird installed on the remote Windows host is prior to 78.8.1. It is, therefore, affected by a vulnerability as referenced in the mfsa2021-17 advisory.

  - Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import     task. If the task runs into a failure, the secret key may remain in memory in its unprotected state.
    (CVE-2021-29950)

Note that Nessus has not tested for this issue 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 78.8.1. It is, therefore, affected by a vulnerability as referenced in the mfsa2021-17 advisory.

  - Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import     task. If the task runs into a failure, the secret key may remain in memory in its unprotected state.
    (CVE-2021-29950)

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

ID	Name	Product	Family	Published	Updated	Severity
148882	CentOS 7 : thunderbird (RHSA-2021:1192)	Nessus	CentOS Local Security Checks	4/21/2021	10/9/2024	high
150685	SUSE SLED15 / SLES15 Security Update : MozillaThunderbird (SUSE-SU-2021:1854-1)	Nessus	SuSE Local Security Checks	6/10/2021	7/13/2023	high
151707	openSUSE 15 Security Update : MozillaThunderbird (openSUSE-SU-2021:1854-1)	Nessus	SuSE Local Security Checks	7/16/2021	5/9/2022	high
148569	RHEL 8 : thunderbird (RHSA-2021:1201)	Nessus	Red Hat Local Security Checks	4/15/2021	11/7/2024	high
148561	RHEL 8 : thunderbird (RHSA-2021:1193)	Nessus	Red Hat Local Security Checks	4/14/2021	11/7/2024	high
149322	Ubuntu 20.04 LTS : Thunderbird vulnerabilities (USN-4936-1)	Nessus	Ubuntu Local Security Checks	5/6/2021	8/28/2024	high
148543	RHEL 8 : thunderbird (RHSA-2021:1190)	Nessus	Red Hat Local Security Checks	4/14/2021	11/7/2024	high
148570	RHEL 7 : thunderbird (RHSA-2021:1192)	Nessus	Red Hat Local Security Checks	4/15/2021	11/7/2024	high
275635	Mozilla Thunderbird < 78.8.1	Nessus	Windows	11/18/2025	11/18/2025	high
275679	Mozilla Thunderbird < 78.8.1	Nessus	MacOS X Local Security Checks	11/18/2025	11/18/2025	high

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