CISA KEV · Known exploitedHigh

CVE-2022-21971

Microsoft Windows

CVE-2022-21971 affects Microsoft Windows. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

CVSS: 7.8
EPSS: 53.9%
CISA KEV: Listed
Published: 2022.02.10

PRIORITY ASSESSMENT

Immediate review

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

Known exploitationConfirmed by CISA KEV

Exploit probability53.9%

Technical severityCVSS 7.8

Vulnerability overview

CVE-2022-21971 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: 10.0.17763.0, 10.0.0, 10.0.20348.0, 10.0.19043.0, < 10.0.17763.2565, < 10.0.18363.2094, < 10.0.19042.1526, < 10.0.19043.1526, < 10.0.19044.1526, < 10.0.22000.493, < 10.0.20348.524
Fixed versions: 10.0.17763.2565, 10.0.18363.2094, 10.0.19042.1526, 10.0.19043.1526, 10.0.19044.1526, 10.0.22000.493, 10.0.20348.524

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2022.09.08

1
Identify
Confirm that Microsoft Windows and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE: CWE-824
KEV added: 2022.08.18
Ransomware use: 미확인