CVE-2025-59287—Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability

Vulnerability Name

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

Description

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

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

Unknown

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.

Additional Notes

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

Related News Articles

• Microsoft: Patch for WSUS flaw disabled Windows Server hotpatchingNovember 3, 2025
• CISA and NSA Issue Urgent Guidance to Secure WSUS and Microsoft Exchange ServersOctober 31, 2025
• CISA orders feds to patch Windows Server WSUS flaw used in attacksOctober 27, 2025

Related Weaknesses

• CWE-502