CVE-2025-59287

Windows Server Update Service (WSUS) Remote Code Execution Vulnerability

CVE-2025-59287 is fixed in 13 products on 1 platform, first by KB5070882, released October 23, 2025. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on October 24, 2025. Patch Radar priority: Patch now.

Patch nowCISA KEV

CVSS

9.8

Critical

Exploitation

Exploited

Listed by CISA

CISA KEV

Oct 24, 2025

Federal due date Nov 14, 2025

EPSS

0.9998

99th percentile

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

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows Server 2012		KB5070887	Oct 23, 2025
Windows Server 2012 (Server Core installation)		KB5070887	Oct 23, 2025
Windows Server 2012 R2		KB5070886	Oct 23, 2025
Windows Server 2012 R2 (Server Core installation)		KB5070886	Oct 23, 2025
Windows Server 2016	14393.8524	KB5070882	Oct 23, 2025
Windows Server 2016 (Server Core installation)	14393.8524	KB5070882	Oct 23, 2025
Windows Server 2019	17763.7922	KB5070883	Oct 23, 2025
Windows Server 2019 (Server Core installation)	17763.7922	KB5070883	Oct 23, 2025
Windows Server 2022		KB5070892	Oct 23, 2025
Windows Server 2022	20348.4297	KB5070884	Oct 23, 2025
Windows Server 2022 (Server Core installation)		KB5070892	Oct 23, 2025
Windows Server 2022 (Server Core installation)	20348.4297	KB5070884	Oct 23, 2025
Windows Server 2022, 23H2 Edition (Server Core installation)	25398.1916	KB5070879	Oct 23, 2025
Windows Server 2025		KB5070893	Oct 23, 2025
Windows Server 2025	26100.6905	KB5070881	Oct 23, 2025
Windows Server 2025 (Server Core installation)		KB5070893	Oct 23, 2025
Windows Server 2025 (Server Core installation)	26100.6905	KB5070881	Oct 23, 2025

Details

Published
October 23, 2025
Weakness
Deserialization of Untrusted Data
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.
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59287

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