CVE-2021-36934
Windows Elevation of Privilege Vulnerability
- Published
- Jul 22, 2021
- Updated
- Aug 10, 2026
- Assigning CNA
- microsoft
- Evidence observed
- Feb 10, 2022
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 99.3%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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. An attacker must have the ability to execute code on a victim system to exploit this vulnerability. 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.
Sources
24- CVE-2021-36934Detection
PowerShell scripts to detect and remediate CVE-2021-36934 privilege escalation vulnerability via SAM permission validation and VSS shadow copy removal.
- oxide_hiveExploit
Exploit for CVE-2021-36934
Responsible use
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