CVE-2021-36934 KEV
Patch first
On CISA KEV — known exploited in the wild, due 2022-02-24.
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.
Scoring
| CVSS | 7.8 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 67.25% — more likely to be exploited than 99% of all CVEs |
| On CISA KEV | yes — remediate by 2022-02-24 |
| Public exploit | none known |
| Published | 2021-07-22 |
| Last modified | 2026-08-10 |
CISA KEV
| Name | Microsoft Windows SAM Local Privilege Escalation Vulnerability |
|---|---|
| Added | 2022-02-10 |
| Due | 2022-02-24 |
| Vendor / product | Microsoft / Windows |
| Ransomware use | none reported |
Affected (5)
| Vendor | Product |
|---|---|
| microsoft | windows 10 1809 |
| microsoft | windows 10 1909 |
| microsoft | windows 10 2004 |
| microsoft | windows 10 20h2 |
| microsoft | windows 10 21h1 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934
- http://packetstormsecurity.com/files/164006/HiveNightmare-AKA-SeriousSAM.html
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36934
- https://www.kb.cert.org/vuls/id/506989
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36934
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