CVE-2025-59287

CRITICAL9.8

CISA KEV

Published 2025-10-14 · Updated 2026-06-17 · Source secure@microsoft.com

Summary

CVE-2025-59287 is a critical-severity (CVSS 9.8) vulnerability in Microsoft Windows. CISA added it to the Known Exploited Vulnerabilities catalog on October 24, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by November 14, 2025. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

All 390 known-exploited Microsoft vulnerabilities →

Description

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

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-502

CISA Known-Exploited Vulnerability

Product: Microsoft — Windows

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

Date added: 2025-10-24 · Due: 2025-11-14

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.

References

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