# CVE-2021-36934: Windows Elevation of Privilege Vulnerability

> CVE-2021-36934: Windows Elevation of Privilege Vulnerability. CVSS 7.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-36934
Last updated: 2026-08-10T15:11:26Z

- Published: 2021-07-22 07:05 UTC · Updated: 2026-08-10 15:11 UTC · Assigner: microsoft
- CVSS: 7.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:T/RC:C
- EPSS: 67.3%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-02-10, federal due date 2022-02-24, ransomware use: Unknown

## 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. 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Microsoft: Windows 10 Version 1809
- Microsoft: Windows 10 Version 1909
- Microsoft: Windows 10 Version 2004
- Microsoft: Windows 10 Version 20H2
- Microsoft: Windows 10 Version 21H1

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-36934)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-36934)
- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-36934 · Markdown: https://rewindex.com/cve/CVE-2021-36934.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-36934 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:10.535Z