CVE-2025-59287
Windows Server Update Service (WSUS) Remote Code Execution Vulnerability
Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
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.
CISA notes
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-59287 ; https://nvd.nist.gov/vuln/detail/CVE-2025-59287
Description
Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:CExploitation Context
as of October 15, 2026- CISA added CVE-2025-59287 to the KEV catalog 10 days after its CVE record was published. The median for entries added in 2025 is 26 days.
- It is one of 391 Microsoft entries in the CISA KEV catalog, and one of 39 added in 2025.
- Its current EPSS score (100.0%) is higher than that of 95% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Microsoft Windows Server 2012 | 6.2.9200.0 to <6.2.9200.25728 |
| Microsoft | Microsoft Windows Server 2012 (Server Core installation) | 6.2.9200.0 to <6.2.9200.25728 |
| Microsoft | Microsoft Windows Server 2012 R2 | 6.3.9600.0 to <6.3.9600.22826 |
| Microsoft | Microsoft Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 to <6.3.9600.22826 |
| Microsoft | Microsoft Windows Server 2016 | 10.0.14393.0 to <10.0.14393.8524 |
| Microsoft | Microsoft Windows Server 2016 (Server Core installation) | 10.0.14393.0 to <10.0.14393.8524 |
| Microsoft | Microsoft Windows Server 2019 | 10.0.17763.0 to <10.0.17763.7922 |
| Microsoft | Microsoft Windows Server 2019 (Server Core installation) | 10.0.17763.0 to <10.0.17763.7922 |
| Microsoft | Microsoft Windows Server 2022 | 10.0.20348.0 to <10.0.20348.4297 |
| Microsoft | Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0 to <10.0.25398.1916 |
| Microsoft | Microsoft Windows Server 2025 | 10.0.26100.0 to <10.0.26100.6905 |
| Microsoft | Microsoft Windows Server 2025 (Server Core installation) | 10.0.26100.0 to <10.0.26100.6905 |
References
5 Links- https://www.bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-windows-server-wsus-flaw-exploited-in-attacks/
- https://hawktrace.com/blog/CVE-2025-59287
- https://www.vicarius.io/vsociety/posts/cve-2025-59287-detection-script-rce-vulnerability-in-windows-server-update-service
- https://www.vicarius.io/vsociety/posts/cve-2025-59287-mitigation-script-rce-vulnerability-in-windows-server-update-service
Record Details
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Tool categories
CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.