Mozilla Thunderbird < 78.15

high Nessus Plugin ID 154061


A mail client installed on the remote macOS or Mac OS X host is affected by multiple vulnerabilities.


The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 78.15. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-46 advisory.

- 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)

- Mozilla developers and community members Andreas Pehrson and Christian Holler reported memory safety bugs present in Thunderbird 78.14. 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)

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


Upgrade to Mozilla Thunderbird version 78.15 or later.

See Also

Plugin Details

Severity: High

ID: 154061

File Name: macos_thunderbird_78_15.nasl

Version: 1.8

Type: local

Agent: macosx

Published: 10/13/2021

Updated: 1/26/2022

Supported Sensors: Nessus Agent, Nessus

Risk Information


Risk Factor: Medium

Score: 5.9


Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2021-38500


Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:mozilla:thunderbird

Required KB Items: MacOSX/Thunderbird/Installed

Exploit Ease: No known exploits are available

Patch Publication Date: 10/5/2021

Vulnerability Publication Date: 10/5/2021

Reference Information

CVE: CVE-2021-38496, CVE-2021-38500

IAVA: 2021-A-0450-S, 2021-A-0461-S