Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability

Microsoft Windows

Microsoft Windows Server Update Service (WSUS) contains a deserialization of untrusted data vulnerability that allows for remote code execution. Added to CISA KEV on 2025-10-24 (federal deadline 2025-11-14).

First seen: 24 Oct 2025
Last update: 24 Oct 2025, 12:00 UTC
Identifiers: CVE-2025-59287
Source: CISA KEV
On the menu as: Windows

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability
Severity: high, exploited in the wild. Patch status: patched.
Affected: Microsoft Windows
Ids: CVE-2025-59287

Microsoft Windows Server Update Service (WSUS) contains a deserialization of untrusted data vulnerability that allows for remote code execution. Added to CISA KEV on 2025-10-24 (federal deadline 2025-11-14).

## Steps
1. This touches infrastructure (windows). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2025-59287") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-59287 https://nvd.nist.gov/vuln/detail/CVE-2025-59287
https://pwned.coffee/i/microsoft-windows-server-update-service-wsus-deserializa-cve-2025-59287

Sources

Totalone hot coffee