CVE-2021-36934 — Security Box Score

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Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-36934HIGH

Microsoft Windows 10 Version 1809 — Windows Elevation of Privilege Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   N  U  H  H  H    7.8   .6725   99.2   YES

AFFECTED
  Product                  Versions        Fixed
  Windows 10 Version 1809  10.0.17763.0 –  —
  Windows 10 Version 1809  10.0.0 –        —
  Windows 10 Version 1909  10.0.0 –        —
  Windows 10 Version 2004  10.0.0 –        —
  Windows 10 Version 20H2  10.0.0 –        —
  Windows 10 Version 21H1  10.0.0 –        —

TIMELINE
  Jul 19  Reserved by microsoft
  Feb 10  Added to CISA KEV, remediation due 2022-02-24
  Feb 10  Published (CNA: microsoft)

CNA: microsoft · CVSS v3.1 · 5 references · NVD status: Analyzed · KEV due February 24, 2022

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 19, 2021	Reserved	Reserved by microsoft
February 10, 2022	KEV ADDED	Added to CISA KEV, remediation due 2022-02-24
February 10, 2022	Published	Published (CNA: microsoft)

Affected

Affected products and packages — 6 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Windows 10 Version 1809	—	10.0.17763.0	—
Microsoft	Windows 10 Version 1809	—	10.0.0	—
Microsoft	Windows 10 Version 1909	—	10.0.0	—
Microsoft	Windows 10 Version 2004	—	10.0.0	—
Microsoft	Windows 10 Version 20H2	—	10.0.0	—
Microsoft	Windows 10 Version 21H1	—	10.0.0	—

References (5)

http://packetstormsecurity.com/files/164006/HiveNightmare-AKA-SeriousSAM.html [Third Party Advisory, VDB Entry]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934 [Patch, Vendor Advisory]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36934 [Patch, Vendor Advisory]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36934 [US Government Resource]
https://www.kb.cert.org/vuls/id/506989 [Third Party Advisory]

Authoritative record: CVE-2021-36934 at cve.org

Vendors: microsoft

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-36934 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.

Description

Lifecycle

Affected

References (5)

Related

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