CVE-2021-36934

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

22/07/2021

Last modified:

30/10/2025

Description

An elevation of privilege vulnerability exists because of overly permissive Access Control Lists (ACLs) on multiple system files, including the Security Accounts Manager (SAM) database. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.<br /> An attacker must have the ability to execute code on a victim system to exploit this vulnerability.<br /> After installing this security update, you must manually delete all shadow copies of system files, including the SAM database, to fully mitigate this vulnerabilty. Simply installing this security update will not fully mitigate this vulnerability. See KB5005357- Delete Volume Shadow Copies.<br />

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

7.80

Severity 3.x

HIGH

Vector 2.0

AV:L/AC:L/Au:N/C:P/I:P/A:P CVSS v2.0 Severity and Metrics:

Base Score: 4.60 MEDIUM
Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P

Attack Vector (AV): Local
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): Physical
Integrity (I): Physical
Availability (A): Physical

Base Score 2.0

4.60

Severity 2.0

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:microsoft:windows_10_1809::::::::		10.0.17763.2114 (excluding)
cpe:2.3:o:microsoft:windows_10_1909::::::::		10.0.18363.1734 (excluding)
cpe:2.3:o:microsoft:windows_10_2004::::::::		10.0.19041.1165 (excluding)
cpe:2.3:o:microsoft:windows_10_20h2::::::::		10.0.19042.1165 (excluding)
cpe:2.3:o:microsoft:windows_10_21h1::::::::		10.0.19043.1165 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2021-36934

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools