Security Updates for Microsoft SharePoint Server 2013 (July 2021)

high Nessus Plugin ID 151605
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 2013 installation on the remote host is affected by multiple vulnerabilities.


The Microsoft SharePoint Server 2013 installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:

- Microsoft SharePoint Server Remote Code Execution Vulnerability (CVE-2021-34467, CVE-2021-34468, CVE-2021-34520)

- Microsoft SharePoint Server Spoofing Vulnerability (CVE-2021-34517)

- Microsoft SharePoint Server Information Disclosure Vulnerability (CVE-2021-34519)

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: 151605

File Name: smb_nt_ms21_july_office_sharepoint_2013.nasl

Version: 1.5

Type: local

Agent: windows

Published: 7/13/2021

Updated: 1/5/2022

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

Risk Information

CVSS Score Source: CVE-2021-34520


Risk Factor: Medium

Score: 6.7


Risk Factor: Medium

Base Score: 6.5

Temporal Score: 4.8

Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P

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


Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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

Vulnerability Information

CPE: cpe:/a:microsoft:sharepoint_server

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 7/13/2021

Vulnerability Publication Date: 7/13/2021

Reference Information

CVE: CVE-2021-34467, CVE-2021-34468, CVE-2021-34517, CVE-2021-34519, CVE-2021-34520

MSKB: 5001984, 5001992

MSFT: MS21-5001984, MS21-5001992

IAVA: 2021-A-0317-S