CISA KEV · Known exploitedHigh

CVE-2021-36942

Microsoft Windows

CVE-2021-36942 affects Microsoft Windows. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

CVSS
7.5
EPSS
66.0%
99.2% percentile
CISA KEV
Listed
Published
2021.08.13
PRIORITY ASSESSMENT

Immediate review

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

Known exploitationConfirmed by CISA KEV
Exploit probability66.0%
Technical severityCVSS 7.5

Vulnerability overview

CVE-2021-36942 affects Microsoft Windows. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

Affected product and versions

Product
Microsoft Windows
Affected versions
10.0.0, 6.0.0, 6.1.0, 6.2.0, 6.3.0, < 10.0.19041.1165, r2, < 10.0.14393.4583, < 10.0.17763.2114, < 10.0.19042.1165
Fixed versions
10.0.19041.1165, 10.0.14393.4583, 10.0.17763.2114, 10.0.19042.1165

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2021.11.17
  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:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE
CWE-749
KEV added
2021.11.03
Ransomware use
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