October 24, 2025 · Applied Cybernetics Group
CVE-2025-59287 — Microsoft Windows
Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability
- Added to KEV
2025-10-24- Federal due date
2025-11-14- Vendor
- Microsoft
- Product
- Windows
- EPSS
- 100.0th percentile (score 1.000, as of
2026-07-13) - NVD CVSS v3.1
- 9.8 (CRITICAL)
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2025-59287
CISA short 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.
NVD description
Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.