CVE-2021-36934

KEV
Published: Lug 22, 2021 Last Modified: Feb 25, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,8
Source: [email protected]
Attack Vector: local
Attack Complexity: low
Privileges Required: low
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
MEDIUM 4,6
Source: [email protected]
Access Vector: local
Access Complexity: low
Authentication: none
Confidentiality: partial
Integrity: partial
Availability: partial

Description

AI Translation Available

<p>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.</p>
<p>An attacker must have the ability to execute code on a victim system to exploit this vulnerability.</p>
<p>After installing this security update, you <em>must</em> manually delete all shadow copies of system files, including the SAM database, to fully mitigate this vulnerabilty. <strong>Simply installing this security update will not fully mitigate this vulnerability.</strong> See <a href='https://support.microsoft.com/topic/1ceaa637-aaa3-4b58-a48b-baf72a2fa9e7'>KB5005357- Delete Volume Shadow Copies</a>.</p>

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,9090
Percentile
1,0th
Updated

EPSS Score Trend (Last 90 Days)

Operating System

Windows 10 21H1 by Microsoft

Product Information
Vendor Microsoft
Product Windows 10 21H1
Version Range Affected
To 10.0.19043.1165 (exclusive)
cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Operating System

Windows 10 1909 by Microsoft

Product Information
Vendor Microsoft
Product Windows 10 1909
Version Range Affected
To 10.0.18363.1734 (exclusive)
cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Operating System

Windows 10 2004 by Microsoft

Product Information
Vendor Microsoft
Product Windows 10 2004
Version Range Affected
To 10.0.19041.1165 (exclusive)
cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Operating System

Windows 10 20H2 by Microsoft

Product Information
Vendor Microsoft
Product Windows 10 20H2
Version Range Affected
To 10.0.19042.1165 (exclusive)
cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Operating System

Windows 10 1809 by Microsoft

Product Information
Vendor Microsoft
Product Windows 10 1809
Version Range Affected
To 10.0.17763.2114 (exclusive)
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://www.cisa.gov/known-exploited-vulnerabilities-catalo…
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021…
http://packetstormsecurity.com/files/164006/HiveNightmare-A…
http://packetstormsecurity.com/files/164006/HiveNightmare-AKA-SeriousSAM.html
https://portal.msrc.microsoft.com/en-US/security-guidance/a…
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-369…
https://www.kb.cert.org/vuls/id/506989
https://www.kb.cert.org/vuls/id/506989
http://packetstormsecurity.com/files/164006/HiveNightmare-A…
http://packetstormsecurity.com/files/164006/HiveNightmare-AKA-SeriousSAM.html
https://portal.msrc.microsoft.com/en-US/security-guidance/a…
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-369…