# CVE-2025-59287: Microsoft Windows Server Update Service deserialization RCE

Source: https://junglewise.ai/threats/cve-2025-59287-microsoft-windows-server-update-service-deserialization-rce  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-10-24. Updated: 2026-05-15  
License: CC BY 4.0 with a link back

CVE-2025-59287 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2025-10-24

Microsoft Windows Server Update Service (WSUS) is a tool used by IT administrators to manage and distribute software updates across corporate networks. A critical security flaw allows an unauthorized attacker to remotely take control of the server by sending specially crafted data. This could lead to a total compromise of the update infrastructure, potentially allowing the attacker to deploy malicious software to all connected computers in the organization.

Technologies: [Microsoft Windows](https://junglewise.ai/threats/technologies/windows). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2025-59287 exploited in the wild?** Yes. CVE-2025-59287 is known to be exploited in the wild, first recorded on 24 October 2025. Treat it as urgent.

**How severe is CVE-2025-59287?** Critical severity, with a CVSS score of 9.8, published 24 October 2025.

**Which products and versions are affected?** Microsoft Windows Server Update Service (WSUS) Windows Server 2012, 2012 R2, 2016, 2019, 2022, 23H2, 2025.

**Is there a fix for CVE-2025-59287?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-59287 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2025-59287?** Check whether you run Microsoft Windows. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A deserialization of untrusted data vulnerability (CWE-502) exists in Microsoft Windows Server Update Service (WSUS). The flaw is rooted in how the service processes incoming data over the network, allowing an unauthenticated attacker to trigger the execution of arbitrary code. The attack vector is network-based and requires no user interaction or prior privileges. Successful exploitation grants the attacker high-level access to the WSUS server, which can be leveraged for lateral movement or infrastructure-wide compromise. Microsoft has released security updates to address this vulnerability, which is confirmed to be exploited in the wild.

## Affected products

- Microsoft Windows Server Update Service (WSUS) Windows Server 2012, 2012 R2, 2016, 2019, 2022, 23H2, 2025

## Timeline

- 2025-10-14: disclosed: Initial disclosure by Microsoft Corporation
- 2025-10-24: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2025-10-24: advisory: NVD publication date

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