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.
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
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Details
- Vendor
- Microsoft
- Product
- Windows Server Update Service (WSUS)
- CVE
- CVE-2025-59287
- Affected versions
- Windows Server 2012 6.2: from 6.2.9200.0 to 6.2.9200.25728 (excluded) — fixed in 6.2.9200.25728
Windows Server 2012 (Server Core installation) 6.2: from 6.2.9200.0 to 6.2.9200.25728 (excluded) — fixed in 6.2.9200.25728
Windows Server 2012 R2 6.3: from 6.3.9600.0 to 6.3.9600.22826 (excluded) — fixed in 6.3.9600.22826
Windows Server 2012 R2 (Server Core installation) 6.3: from 6.3.9600.0 to 6.3.9600.22826 (excluded) — fixed in 6.3.9600.22826
Windows Server 2016 10.0: from 10.0.14393.0 to 10.0.14393.8524 (excluded) — fixed in 10.0.14393.8524
Windows Server 2016 (Server Core installation) 10.0: from 10.0.14393.0 to 10.0.14393.8524 (excluded) — fixed in 10.0.14393.8524
Windows Server 2019 10.0: from 10.0.17763.0 to 10.0.17763.7922 (excluded) — fixed in 10.0.17763.7922
Windows Server 2019 (Server Core installation) 10.0: from 10.0.17763.0 to 10.0.17763.7922 (excluded) — fixed in 10.0.17763.7922
Windows Server 2022 10.0: from 10.0.20348.0 to 10.0.20348.4297 (excluded) — fixed in 10.0.20348.4297
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0: from 10.0.25398.0 to 10.0.25398.1916 (excluded) — fixed in 10.0.25398.1916
Windows Server 2025 10.0: from 10.0.26100.0 to 10.0.26100.6905 (excluded) — fixed in 10.0.26100.6905
Windows Server 2025 (Server Core installation) 10.0: from 10.0.26100.0 to 10.0.26100.6905 (excluded) — fixed in 10.0.26100.6905 (from the advisory and NVD; check the exact builds in the official advisory) - CVSS score
- 9.8
- Actively exploited
- Yes, listed in the CISA Known Exploited Vulnerabilities catalog
- CISA due date
- November 14, 2025 (deadline for US federal agencies: a good benchmark for you too)
- Source
- CISA KEV – original advisory
- Published
- October 24, 2025
The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.