CISA KEV · Known exploitedHigh

CVE-2025-21334

Microsoft Windows

CVE-2025-21334 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: 1.53%
CISA KEV: Listed
Published: 2025.01.15

PRIORITY ASSESSMENT

Immediate review

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

Known exploitationConfirmed by CISA KEV

Exploit probability1.53%

Technical severityCVSS 7.8

Vulnerability overview

CVE-2025-21334 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: 10.0.19044.0, 10.0.19045.0, 10.0.22621.0, 10.0.22631.0, 10.0.26100.0, 10.0.25398.0, < 10.0.19044.5371, < 10.0.19045.5371, < 10.0.22621.4751, < 10.0.22631.4751, < 10.0.26100.2894, < 10.0.25398.1369
Fixed versions: 10.0.19044.5371, 10.0.19045.5371, 10.0.22621.4751, 10.0.22631.4751, 10.0.26100.2894, 10.0.25398.1369

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Due date: 2025.02.04

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-416
KEV added: 2025.01.14
Ransomware use: 미확인