Actively exploited · Published Oct 14, 2025 · Assigned by microsoft
CVE-2025-59287Windows Server Update Service (WSUS) Remote Code Execution Vulnerability
Critical 9.8 Exploited
In plain English
A critical-severity unsafe deserialization in Windows Server 2012 from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on October 24, 2025). The chance it is exploited in the next 30 days is estimated at 100.0% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, Nuclei, public proof-of-concept code. 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 guidance
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Federal agencies must remediate by Nov 14, 2025.
Official description
Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
Affected products (as reported)
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
References
- Windows Server Update Service (WSUS) Remote Code Execution Vulnerability vendor-advisory, patch
- https://gist.github.com/hawktrace/880b54fb9c07ddb028baaae401bd3951 exploit
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59287 government-resource
- 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