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CISA KEV · Known exploitedHigh

CVE-2021-36934

Microsoft Windows

<p>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.</p> <p>An attacker must have the ability to execute code on a victim system to exploit this vulnerability.</p> <p>After installing this security update, you <em>must</em> manually dele...

CVSS
7.8
EPSS
67.3%
99.2% percentile
CISA KEV
Listed
Published
2021.07.22
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability67.3%
Technical severityCVSS 7.8

Vulnerability overview

<p>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.</p> <p>An attacker must have the ability to execute code on a victim system to exploit this vulnerability.</p> <p>After installing this security update, you <em>must</em> manually dele...

Affected product and versions

Product
Microsoft Windows
Affected versions
10.0.0, < 10.0.17763.2114, < 10.0.18363.1734, < 10.0.19041.1165, < 10.0.19042.1165, < 10.0.19043.1165
Fixed versions
10.0.17763.2114, 10.0.18363.1734, 10.0.19041.1165, 10.0.19042.1165, 10.0.19043.1165

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2022.02.24
  1. 1
    Identify

    Confirm that Microsoft Windows and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-1220
KEV added
2022.02.10
Ransomware use
미확인
CVE-2021-36934 — Microsoft Windows | SECUFOCUS NOW