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2025-040: Critical Vulnerability in Windows Server Update Service (WSUS) ↗ source

October 24, 2025 CERT-EU Advisory
Source: https://cert.europa.eu/publications/security-advisories/2025-040/

Summary

This vulnerability could allow a remote unauthenticated attacker to execute code on the targeted systems [1]. A proof-of-concept is publicly available for this vulnerability [2]. The vulnerability CVE-2025-59287, with a CVSS score of 9.8, is an unsafe deserialisation issue that may allow a remote, unauthenticated attacker to execute malicious code on affected assets This vulnerability affects Microsoft Windows Server with the WSUS server role enabled. Microsoft published an update for the following versions of Windows Server: It is recommended to update affected assets as soon as possible.

News Coverage

No coverage found in monitored research blogs or news feeds.

CVEs Referenced in This Publication

CVECVSSAffected
CVE-2025-59287 9.8 Critical Microsoft Windows Microsoft Windows Server Update Service (WSUS) contains a deserialization of untrusted data vulnerability that allows for remote code execution.

Extracted from the publication text. Each CVE links to its tracked detail page.

Vendors Named in This Publication

Microsoft 388 KEV

Each vendor links to its Known Exploited Vulnerabilities catalog page. Only vendors that appear in the KEV catalog are listed, either because the publication cites one of their KEV entries or because it names them directly.