CISA KEV · Known exploitedCritical

CVE-2025-59287

Microsoft Windows

Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.

CVSS: 9.8
EPSS: 99.9%
CISA KEV: Listed
Published: 2025.10.15

PRIORITY ASSESSMENT

Immediate review

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

Known exploitationConfirmed by CISA KEV

Exploit probability99.9%

Technical severityCVSS 9.8

Vulnerability overview

Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.

Affected product and versions

Product: Microsoft Windows
Affected versions: 6.2.9200.0, 6.3.9600.0, 10.0.14393.0, 10.0.17763.0, 10.0.20348.0, 10.0.25398.0, 10.0.26100.0, r2, < 10.0.14393.8524, < 10.0.17763.7922, < 10.0.20348.4297, < 10.0.25398.1916, < 10.0.26100.6905
Fixed versions: 10.0.14393.8524, 10.0.17763.7922, 10.0.20348.4297, 10.0.25398.1916, 10.0.26100.6905

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Due date: 2025.11.14

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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-502
KEV added: 2025.10.24
Ransomware use: 미확인