CVE-2021-36934
Plain English Summary
AI-powered analysis for quick understanding
This vulnerability allows an attacker to gain full control over a Windows 10 system, enabling them to install software, access or modify data, and create new user accounts with complete rights. To exploit this, the attacker must already be able to run code on the system, and simply updating the software isn't enough; they also need to manually delete certain backup files to fully secure the system.
Technical Description
<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>
CVSS Vector Analysis
Vector String
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploit Resources
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Official References
Quick Information
Published
Jul 22, 2021
over 4 years ago
Last Modified
Feb 25, 2026
about 1 month ago
Vendor
microsoft
Product
windows 10 1809
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