Security Updates for Microsoft Office Online Server and Microsoft Office Web Apps (January 2021)

High Nessus Plugin ID 144883

New! Vulnerability Priority Rating (VPR)

Tenable calculates a dynamic VPR for every vulnerability. VPR combines vulnerability information with threat intelligence and machine learning algorithms to predict which vulnerabilities are most likely to be exploited in attacks. Read more about what VPR is and how it's different from CVSS.

VPR Score: 5.9


The Microsoft Office Online Server or Microsoft Office Web Apps installation on the remote host is affected by multiple vulnerabilities.


The Microsoft Office Online Server or Microsoft Office Web Apps installation on the remote host is missing security updates. It is, therefore, affected by a remote code execution vulnerability. An attacker can exploit this to execute arbitrary code when a maliciously modified file is opened. (CVE-2021-1713, CVE-2021-1714, CVE-2021-1715, CVE-2021-1716)


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

See Also

Plugin Details

Severity: High

ID: 144883

File Name: smb_nt_ms21_jan_office_web.nasl

Version: 1.6

Type: local

Agent: windows

Published: 2021/01/12

Updated: 2021/01/19

Dependencies: 93232, 57033, 84669, 27524, 13855

Risk Information

Risk Factor: High

VPR Score: 5.9

CVSS Score Source: CVE-2020-1713

CVSS v2.0

Base Score: 9.3

Temporal Score: 6.9

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

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:/a:microsoft:office_online_server, cpe:/a:microsoft:office_web_apps

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 2021/01/12

Vulnerability Publication Date: 2021/01/12

Reference Information

CVE: CVE-2021-1713, CVE-2021-1714, CVE-2021-1715, CVE-2021-1716

MSKB: 4493160, 4493171

MSFT: MS20-4493160, MS20-4493171

IAVA: 2021-A-0016, 2021-A-0024