CVE Watch—

CVE-2025-59287

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

CVSS

—

No CVSS

EPSS

100.0%

p100

KEV

YES

Oct 24, 2025

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

100.0%EPSS · 30 days100.0%

2026-06-302026-07-16

KEV catalog record

Product

Microsoft / Windows

Vulnerability

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

Added to KEV

Oct 24, 2025

Remediate by

Nov 14, 2025

Known ransomware use

Summary description

Microsoft Windows Server Update Service (WSUS) contains a deserialization of untrusted data vulnerability that allows for remote code execution.

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.

Notes

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-59287 ; https://nvd.nist.gov/vuln/detail/CVE-2025-59287

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