Mozilla Thunderbird < 78.11

high Nessus Plugin ID 150158


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 78.11. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-26 advisory.

- A locally-installed hostile program could send `WMCOPYDATA` messages that Thunderbird would processing incorrectly, leading to an out-of-bounds read. This bug only affects Thunderbird on Windows. Other operating systems are unaffected. (CVE-2021-29964)

- Mozilla developers Gabriele Svelto, Anny Gakhokidze, Alexandru Michis, Christian Holler reported memory safety bugs present in Thunderbird 78.11. 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.

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 78.11 or later.

See Also

Plugin Details

Severity: High

ID: 150158

File Name: macos_thunderbird_78_11.nasl

Version: 1.3

Type: local

Agent: macosx

Published: 6/3/2021

Updated: 6/28/2021

Supported Sensors: Nessus Agent

Risk Information


Risk Factor: High

Score: 7.4


Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

Temporal Vector: E:U/RL:OF/RC:C

CVSS Score Source: CVE-2021-29967


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: 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: 6/3/2021

Vulnerability Publication Date: 6/2/2021

Reference Information

CVE: CVE-2021-29964, CVE-2021-29967