Security Updates for Microsoft SharePoint Server 2019 (October 2021)

high Nessus Plugin ID 154030
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 SharePoint Server 2019 installation on the remote host is affected by multiple vulnerabilities.


The Microsoft SharePoint Server 2019 installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities :

- An information disclosure vulnerability. An attacker can exploit this to disclose potentially sensitive information. (CVE-2021-40482)

- A session spoofing vulnerability exists. An attacker can exploit this to perform actions with the privileges of another user. (CVE-2021-40483, CVE-2021-40484)

- A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2021-40486, CVE-2021-40487, CVE-2021-41344) 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 the following security updates to address these issues:

See Also

Plugin Details

Severity: High

ID: 154030

File Name: smb_nt_ms21_oct_office_sharepoint_2019.nasl

Version: 1.4

Type: local

Agent: windows

Published: 10/12/2021

Updated: 10/21/2021

Dependencies: ms_bulletin_checks_possible.nasl, smb_hotfixes.nasl, microsoft_sharepoint_installed.nbin

Risk Information

CVSS Score Source: CVE-2021-40486


Risk Factor: High

Score: 8.4


Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

Temporal Vector: CVSS2#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: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:*:*:*:*

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 10/11/2021

Vulnerability Publication Date: 10/11/2021

Reference Information

CVE: CVE-2021-41344, CVE-2021-40482, CVE-2021-40483, CVE-2021-40484, CVE-2021-40486, CVE-2021-40487

MSKB: 5002028

MSFT: MS21-5002028

IAVA: 2021-A-0469