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:CAffected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Windows Server 2012 | 6.2.9200.0 to <6.2.9200.25728 |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0 to <6.2.9200.25728 |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 to <6.3.9600.22826 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 to <6.3.9600.22826 |
| Microsoft | Windows Server 2016 | 10.0.14393.0 to <10.0.14393.8524 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 to <10.0.14393.8524 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 to <10.0.17763.7922 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 to <10.0.17763.7922 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 to <10.0.20348.4297 |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0 to <10.0.25398.1916 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 to <10.0.26100.6905 |
| 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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Related Tool Categories
Tool categories that test for or protect against this vulnerability class.
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.