Is CVE-2025-59287 being actively exploited?

Yes. CVE-2025-59287 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on October 24, 2025.

What is the CVSS score for CVE-2025-59287?

CVE-2025-59287 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2025-59287

CRITICAL · CVSS 9.8CISA KEV: actively exploitedEPSS 100.0%EU EUVD: exploited

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

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-502
EPSS score: 100.0% (100th percentile)
In CISA KEV: Yes, added October 24, 2025
In EU EUVD: Yes (EUVD-2025-34268)
Published: October 14, 2025
NVD last modified: June 17, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability

Added to the KEV catalog on October 24, 2025; federal remediation due November 14, 2025.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2025-34268 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on February 26, 2026.

View on the EU Vulnerability Database

Affected products

microsoft / windows server 2012
microsoft / windows server 2012
microsoft / windows server 2016
microsoft / windows server 2019
microsoft / windows server 2022
microsoft / windows server 2022 23h2
microsoft / windows server 2025

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

Microsoft Windows 10 and Server version 1903 (May 2019 Update) - Microsoft Corporation - Common Criteria 2019-22-INF-2839 - archived

References

https://gist.github.com/hawktrace/880b54fb9c07ddb028baaae401bd3951(Third Party Advisory)
https://hawktrace.com/blog/CVE-2025-59287(Exploit, Third Party Advisory)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59287(Vendor Advisory)
https://www.bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-windows-server-wsus-flaw-exploited-in-attacks/(Press/Media Coverage)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59287(Third Party Advisory, US Government Resource)
https://www.vicarius.io/vsociety/posts/cve-2025-59287-detection-script-rce-vulnerability-in-windows-server-update-service(Third Party Advisory)
https://www.vicarius.io/vsociety/posts/cve-2025-59287-mitigation-script-rce-vulnerability-in-windows-server-update-service(Mitigation, Third Party Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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