Security Updates for Microsoft Office Products (September 2021)

high Nessus Plugin ID 153387
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 Products are affected by multiple vulnerabilities.


The Microsoft Office Products are missing security updates. It is, therefore, affected by multiple vulnerabilities:

- A session spoofing vulnerability exists. An attacker can exploit this to perform actions with the privileges of another user. (CVE-2021-38650)

- A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2021-38646, CVE-2021-38655, CVE-2021-38658, CVE-2021-38659, CVE-2021-38660)

- An information disclosure vulnerability in the graphics component. An attacker can exploit this to disclose sensitive information. (CVE-2021-38657)


Microsoft has released the following security updates to address this issue:

For Office 365, Office 2016 C2R, or Office 2019, ensure automatic updates are enabled or open any office app and manually perform an update.

See Also

Plugin Details

Severity: High

ID: 153387

File Name: smb_nt_ms21_sep_office.nasl

Version: 1.5

Type: local

Agent: windows

Published: 9/14/2021

Updated: 10/14/2021

Dependencies: office_installed.nasl, smb_hotfixes.nasl, ms_bulletin_checks_possible.nasl

Risk Information

CVSS Score Source: CVE-2021-38658


Risk Factor: Medium

Score: 6.7


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

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 9/14/2021

Vulnerability Publication Date: 9/14/2021

Reference Information

CVE: CVE-2021-38646, CVE-2021-38650, CVE-2021-38655, CVE-2021-38657, CVE-2021-38658, CVE-2021-38659, CVE-2021-38660

MSKB: 4484103, 4484108, 5001958, 5001997, 5002005, 5002007

MSFT: MS21-4484103, MS21-4484108, MS21-5001958, MS21-5001997, MS21-5002005, MS21-5002007

IAVA: 2021-A-0428-S, 2021-A-0425-S