CVE-2025-59287 KEV
9.8
CRITICAL · CVSS 3.1 · EPSS 100% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2025-11-14.
Description
Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 99.98% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-502 |
| On CISA KEV | yes — remediate by 2025-11-14 |
| Public exploit | none known |
| Published | 2025-10-14 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability |
|---|---|
| Added | 2025-10-24 |
| Due | 2025-11-14 |
| Vendor / product | Microsoft / Windows |
| Ransomware use | none reported |
Affected (6)
| Vendor | Product |
|---|---|
| microsoft | windows server 2012 |
| microsoft | windows server 2016 |
| microsoft | windows server 2019 |
| microsoft | windows server 2022 |
| microsoft | windows server 2022 23h2 |
| microsoft | windows server 2025 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59287
- https://hawktrace.com/blog/CVE-2025-59287
- https://www.bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-windows-server-wsus-flaw-exploited-in-attacks/
- 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
- https://gist.github.com/hawktrace/880b54fb9c07ddb028baaae401bd3951
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59287
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