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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAffected software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1809 | >= 10.0.17763.0, < 10.0.17763.2114 |
| Microsoft | Windows 10 Version 1809 | >= 10.0.0, < 10.0.17763.2114 |
| Microsoft | Windows 10 Version 1909 | >= 10.0.0, < 10.0.18363.1734 |
| Microsoft | Windows 10 Version 2004 | >= 10.0.0, < 10.0.19041.1165 |
| Microsoft | Windows 10 Version 20H2 | >= 10.0.0, < 10.0.19042.1165 |
| Microsoft | Windows 10 Version 21H1 | >= 10.0.0, < 10.0.19043.1165 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934Patch, Vendor Advisory
- http://packetstormsecurity.com/files/164006/HiveNightmare-AKA-SeriousSAM.htmlThird Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36934Patch, Vendor Advisory
- https://www.kb.cert.org/vuls/id/506989Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36934US Government Resource
Timeline
- Published
- Jul 22, 2021
- Last modified
- Aug 10, 2026
- Added to CISA KEV
- Feb 10, 2022
- NVD status
- Analyzed