Security Update for Microsoft Azure Active Directory Connect (August 2021)

high Nessus Plugin ID 152428
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 remote host has an application installed that is missing a security update.


An authentication bypass exists in Microsoft Azure Active Directory Connect. An attacker with domain user credentials may perform a man-in-the-middle between a domain controller and the Azure AD Connect server to exploit this vulnerability.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Upgrade Azure Active Directory Connect to version, or later.

See Also

Plugin Details

Severity: High

ID: 152428

File Name: smb_nt_ms21_aug_azure_ad_connect.nasl

Version: 1.4

Type: local

Agent: windows

Family: Windows

Published: 8/10/2021

Updated: 9/22/2021

Dependencies: microsoft_azure_ad_connect_installed.nbin

Risk Information

CVSS Score Source: CVE-2021-36949


Risk Factor: High

Score: 7.4


Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.6

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

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


Risk Factor: High

Base Score: 7.1

Temporal Score: 6.2

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

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

Vulnerability Information

CPE: x-cpe:/a:microsoft:azure_active_directory_connect

Required KB Items: installed_sw/Microsoft Azure AD Connect

Exploit Ease: No known exploits are available

Patch Publication Date: 8/10/2021

Vulnerability Publication Date: 8/10/2021

Reference Information

CVE: CVE-2021-36949

IAVA: 2021-A-0433