Security Updates for Internet Explorer (September 2021)

high Nessus Plugin ID 153374
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 Internet Explorer installation on the remote host is missing a security update.


The Internet Explorer installation on the remote host is missing a security update. It is, therefore, affected by a memory corruption error in the scripting engine. An unauthenticated, remote attacker can exploit this to execute arbitrary commands. (CVE-2021-40444)


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

See Also

Plugin Details

Severity: High

ID: 153374

File Name: smb_nt_ms21_sep_internet_explorer.nasl

Version: 1.4

Type: local

Agent: windows

Published: 9/14/2021

Updated: 11/22/2021

Dependencies: smb_check_rollup.nasl, smb_hotfixes.nasl, ms_bulletin_checks_possible.nasl

Risk Information

CVSS Score Source: CVE-2021-40444


Risk Factor: Critical

Score: 9.8


Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

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

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


Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

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

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

Vulnerability Information

CPE: cpe:/a:microsoft:ie

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/14/2021

Vulnerability Publication Date: 9/14/2021

Reference Information

CVE: CVE-2021-40444

MSKB: 5005563, 5005606, 5005613, 5005623, 5005633

MSFT: MS21-5005563, MS21-5005606, MS21-5005613, MS21-5005623, MS21-5005633