Security Updates for Microsoft Office Online Server (October 2019)

high Nessus Plugin ID 129885
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 Online Server installation on the remote host is missing a security update.


The Microsoft Office Online Server installation on the remote host is missing a security update. It is, therefore, affected by a remote code execution vulnerability in Microsoft Excel software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.


Upgrade to the latest version of Office Online Server and apply the KB4475595 patch to address this issue.

See Also

Plugin Details

Severity: High

ID: 129885

File Name: smb_nt_ms19_oct_office_web.nasl

Version: 1.5

Type: local

Agent: windows

Published: 10/15/2019

Updated: 3/13/2020

Dependencies: office_installed.nasl, microsoft_owa_installed.nbin, microsoft_office_compatibility_pack_installed.nbin, smb_hotfixes.nasl, ms_bulletin_checks_possible.nasl

Risk Information

CVSS Score Source: CVE-2019-1331


Risk Factor: Medium

Score: 5.9


Risk Factor: High

Base Score: 9.3

Temporal Score: 6.9

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

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: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_online_server

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 10/8/2019

Vulnerability Publication Date: 10/8/2019

Reference Information

CVE: CVE-2019-1331

MSKB: 4475595

MSFT: MS19-4475595