CVE-2025-59287
Microsoft Windows Server 2012, Microsoft Windows Server 2012 (Server Core installation), Microsoft Windows Server 2012 R2
Published 14 Oct 2025 · updated 17 Jun 2026 · Analyzed
9.8 Critical · CVSS 3.1, microsoft.com
Exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on 24 Oct 2025, with a remediation deadline of 14 Nov 2025 for US federal agencies.
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.
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59287 · Vendor Advisory
- hawktrace.com/blog/CVE-2025-59287 · Exploit, Third Party Advisory
- www.bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-windows-server-wsus-flaw-exploited-in-attacks/ · Press/Media Coverage
- www.vicarius.io/vsociety/posts/cve-2025-59287-detection-script-rce-vulnerability-in-windows-server-update-service · Third Party Advisory
- www.vicarius.io/vsociety/posts/cve-2025-59287-mitigation-script-rce-vulnerability-in-windows-server-update-service · Mitigation, Third Party Advisory
- gist.github.com/hawktrace/880b54fb9c07ddb028baaae401bd3951 · Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59287 · Third Party Advisory, US Government Resource