Security Updates for Microsoft Office (October 2021) (macOS)

high Nessus Plugin ID 154142
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


The Microsoft Office product installed on the remote host is affected by multiple vulnerabilities.


The Microsoft Office product installed on the remote host is affected by multiple vulnerabilities, as follows:

- An information disclosure vulnerability in rich text editing that can be exploited by a low privileged, local user. (CVE-2021-40454)

- Remote code execution vulnerabilities in Excel that can be exploited by an unauthenticated user.
(CVE-2021-40474, CVE-2021-40485) Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.


Microsoft has released a set of patches for Microsoft Office for Mac.

See Also

Plugin Details

Severity: High

ID: 154142

File Name: macos_ms21_oct_office.nasl

Version: 1.3

Type: local

Agent: macosx

Published: 10/14/2021

Updated: 10/19/2021

Dependencies: macosx_office_installed.nbin

Risk Information

CVSS Score Source: CVE-2021-40474


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


Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/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:microsoft:office, cpe:/a:microsoft:excel

Required KB Items: Host/MacOSX/Version, installed_sw/Microsoft Excel

Exploit Ease: No known exploits are available

Patch Publication Date: 10/12/2021

Vulnerability Publication Date: 10/12/2021

Reference Information

CVE: CVE-2021-40454, CVE-2021-40474, CVE-2021-40485

IAVA: 2021-A-0473, 2021-A-0465, 2021-A-0468