CISA KEV · Known exploitedHigh

CVE-2025-21418

Microsoft Windows

CVE-2025-21418 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: 1.54%
CISA KEV: Listed
Published: 2025.02.12

PRIORITY ASSESSMENT

Immediate review

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

Known exploitationConfirmed by CISA KEV

Exploit probability1.54%

Technical severityCVSS 7.8

Vulnerability overview

CVE-2025-21418 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: 10.0.10240.0, 10.0.14393.0, 10.0.17763.0, 10.0.19044.0, 10.0.19045.0, 10.0.22621.0, 10.0.22631.0, 10.0.26100.0, 6.1.7601.0, 6.0.6003.0, 6.2.9200.0, 6.3.9600.0, 10.0.20348.0, 10.0.25398.0, < 10.0.10240.20915, < 10.0.17763.6893, < 10.0.19044.5487, < 10.0.19045.5487, < 10.0.22621.4890, < 10.0.22631.4890
Fixed versions: 10.0.10240.20915, 10.0.17763.6893, 10.0.19044.5487, 10.0.19045.5487, 10.0.22621.4890, 10.0.22631.4890, 10.0.26100.3107, 10.0.14393.7785, 10.0.20348.3148, 10.0.25398.1425

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: 2025.03.04

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-122
KEV added: 2025.02.11
Ransomware use: 미확인