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ExploitedIn CISA KEVFix available

CVE-2021-36934

Exploitation confirmed. First attested on 2022-02-10 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2021-07-22
  • Fixed in10.0.17763.2114

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-07-2207:15CVE publishedNVD
  2. 2022-02-10Added to the CISA KEV catalogCISA KEV
  3. 2022-02-10Listed as exploited by GCVEGCVE
  4. 2022-02-10Exploitation first reportedCISA KEV
  5. 2025-02-0418:15SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-36934?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-36934?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Microsoft windows 10 1809
BranchAffectedFixed in
10.0< 10.0.17763.211410.0.17763.2114
Microsoft windows 10 1909
BranchAffectedFixed in
10.0< 10.0.18363.173410.0.18363.1734
Microsoft windows 10 2004
BranchAffectedFixed in
10.0< 10.0.19041.116510.0.19041.1165

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA6 products

As microsoft, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Microsoft Windows 10 Version 1809

    platforms: 32-bit Systems, x64-based Systems

    Affected
    • ≥ 10.0.17763.0, < 10.0.17763.2114fixed in 10.0.17763.2114custom
  • Microsoft Windows 10 Version 1809

    platforms: ARM64-based Systems

    Affected
    • ≥ 10.0.0, < 10.0.17763.2114fixed in 10.0.17763.2114custom
  • Microsoft Windows 10 Version 1909

    platforms: 32-bit Systems, ARM64-based Systems, x64-based Systems

    Affected
    • ≥ 10.0.0, < 10.0.18363.1734fixed in 10.0.18363.1734custom
  • Microsoft Windows 10 Version 2004

    platforms: 32-bit Systems, ARM64-based Systems, x64-based Systems

    Affected
    • ≥ 10.0.0, < 10.0.19041.1165fixed in 10.0.19041.1165custom
  • Microsoft Windows 10 Version 20H2

    platforms: 32-bit Systems, ARM64-based Systems

    Affected
    • ≥ 10.0.0, < 10.0.19042.1165fixed in 10.0.19042.1165custom
  • Microsoft Windows 10 Version 21H1

    platforms: 32-bit Systems, ARM64-based Systems, x64-based Systems

    Affected
    • ≥ 10.0.0, < 10.0.19043.1165fixed in 10.0.19043.1165custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-08-10

Fix

  1. Update Microsoft windows 10 1809 to 10.0.17763.2114
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-02-24

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
20 repositories, unverifiedHuskyHacks/ShadowStealJoranSlingerland/CVE-2021-36934n3tsurge/CVE-2021-36934Wh04m1001/VSSCopyWiredPulse/Invoke-HiveNightmare
PoC-in-GitHub
Metasploit modules
1 modulepost/windows/gather/credentials/windows_sam_hivenightmarerank: normalModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-02-10
Patch Due Date
2022-02-24
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2021-07-22
Last Modified
2026-08-10
NVD status
Analyzed
GitHub Advisory
GHSA-x4m2-px5g-5q55

Frequently asked questions

What is CVE-2021-36934?

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.

Is CVE-2021-36934 actively exploited?

Yes. CVE-2021-36934 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-02-24.

What is the CVSS score for CVE-2021-36934?

CVE-2021-36934 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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