The remote Ubuntu 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4202-1 advisory.

  - A crafted S/MIME message consisting of an inner encryption layer and an outer SignedData layer was shown     as having a valid digital signature, although the signer might have had no access to the contents of the     encrypted message, and might have stripped a different signature from the encrypted message. Previous     versions had only suppressed showing a digital signature for messages with an outer multipart/signed     layer. This vulnerability affects Thunderbird < 68.1.1. (CVE-2019-11755)

  - When following the value's prototype chain, it was possible to retain a reference to a locale, delete it,     and subsequently reference it. This resulted in a use-after-free and a potentially exploitable crash. This     vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2. (CVE-2019-11757)

  - Mozilla community member Philipp reported a memory safety bug present in Firefox 68 when 360 Total     Security was installed. This bug showed evidence of memory corruption in the accessibility engine and we     presume that with enough effort that it could be exploited to run arbitrary code. This vulnerability     affects Firefox < 69, Thunderbird < 68.2, and Firefox ESR < 68.2. (CVE-2019-11758)

  - An attacker could have caused 4 bytes of HMAC output to be written past the end of a buffer stored on the     stack. This could be used by an attacker to execute arbitrary code or more likely lead to a crash. This     vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2. (CVE-2019-11759)

  - A fixed-size stack buffer could overflow in nrappkit when doing WebRTC signaling. This resulted in a     potentially exploitable crash in some instances. This vulnerability affects Firefox < 70, Thunderbird <     68.2, and Firefox ESR < 68.2. (CVE-2019-11760)

  - By using a form with a data URI it was possible to gain access to the privileged JSONView object that had     been cloned into content. Impact from exposing this object appears to be minimal, however it was a bypass     of existing defense in depth mechanisms. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and     Firefox ESR < 68.2. (CVE-2019-11761)

  - If two same-origin documents set document.domain differently to become cross-origin, it was possible for     them to call arbitrary DOM methods/getters/setters on the now-cross-origin window. This vulnerability     affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2. (CVE-2019-11762)

  - Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly     parsing these entities. This could have led to HTML comment text being treated as HTML which could have     led to XSS in a web application under certain conditions. It could have also led to HTML entities being     masked from filters - enabling the use of entities to mask the actual characters of interest from filters.
    This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2. (CVE-2019-11763)

  - Mozilla developers and community members reported memory safety bugs present in Firefox 69 and Firefox ESR     68.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some     of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 70, Thunderbird <     68.2, and Firefox ESR < 68.2. (CVE-2019-11764)

  - In libexpat before 2.2.8, crafted XML input could fool the parser into changing from DTD parsing to     document parsing too early; a consecutive call to XML_GetCurrentLineNumber (or XML_GetCurrentColumnNumber)     then resulted in a heap-based buffer over-read. (CVE-2019-15903)

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
147312	NewStart CGSL MAIN 4.06 : thunderbird Multiple Vulnerabilities (NS-SA-2021-0002)	Nessus	NewStart CGSL Local Security Checks	3/10/2021	4/25/2023	critical
183628	Ubuntu 18.04 LTS : Thunderbird vulnerabilities (USN-4202-1)	Nessus	Ubuntu Local Security Checks	10/21/2023	10/21/2023	high

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high