CVE-2025-59287
Critical 9.8 Exploited in the wild (KEV)
Confirmed active exploitation — CISA KEV catalog
- Name
- Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability
- Added to catalog
- Remediation due date (US federal)
- 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.
Description
Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
Metrics
- CVSS 3.1
-
9.8 (CRITICAL)
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 100% (percentile: 100) as of 1 November 2026
- CWE
- CWE-502
Affected products
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 Vendor Advisory
- https://hawktrace.com/blog/CVE-2025-59287 ExploitThird Party Advisory
- https://www.bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-window… Press/Media Coverage
- https://www.vicarius.io/vsociety/posts/cve-2025-59287-detection-script-rce-vuln… Third Party Advisory
- https://www.vicarius.io/vsociety/posts/cve-2025-59287-mitigation-script-rce-vul… MitigationThird Party Advisory
- https://gist.github.com/hawktrace/880b54fb9c07ddb028baaae401bd3951 Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025… Third Party AdvisoryUS Government Resource