CISA KEV · Known exploitedHigh

CVE-2023-21823

Microsoft Windows

CVE-2023-21823 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: 5.56%
CISA KEV: Listed
Published: 2023.02.15

PRIORITY ASSESSMENT

Immediate review

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

Known exploitationConfirmed by CISA KEV

Exploit probability5.56%

Technical severityCVSS 7.8

Vulnerability overview

CVE-2023-21823 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: 16.0.1, 2.0.0, 10.0.17763.0, 10.0.0, 10.0.20348.0, 10.0.19043.0, 10.0.22621.0, 10.0.19045.0, 10.0.10240.0, 10.0.14393.0, 6.0.6003.0, 6.1.7601.0, 6.2.9200.0, 6.3.9600.0, < 10.0.10240.19747, < 10.0.14393.5717, < 10.0.17763.4010, < 10.0.19042.2604, < 10.0.19044.2604, < 10.0.19045.2604
Fixed versions: 10.0.10240.19747, 10.0.14393.5717, 10.0.17763.4010, 10.0.19042.2604, 10.0.19044.2604, 10.0.19045.2604, 10.0.22000.1574, 10.0.22621.1265

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2023.03.07

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:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-190
KEV added: 2023.02.14
Ransomware use: 미확인