CVE-2025-59287 Microsoft Windows: unsafe data loading
In plain words: The program unpacks saved data from outside without checking it is safe. Usually lets an attacker run code on the server.
Confirmed exploited by CISA on · US federal patch deadline Nov 14, 2025
What to do
- Install Microsoft's security update for Windows. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Turn on automatic updates for the operating system and for Office, PDF and archive apps.
- Be careful with unexpected attachments — documents, .zip/.rar files and shortcuts are common bait.
- Use a normal (non-admin) account day to day and keep built-in protection like Microsoft Defender on.
Who is affected
Could reach you. This one is aimed at devices or apps of the kind people own.
What's at risk: Your files, saved passwords and accounts. Many of these let a program that is already running gain full administrator control.
The details
- Official name
- Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability
- Product
- Microsoft Windows
- CISA description
- Microsoft Windows Server Update Service (WSUS) contains a deserialization of untrusted data vulnerability that allows for remote code execution.
- Type of flaw
- Unsafe data loading (CWE-502)
- Confirmed exploited
- Oct 24, 2025
- US federal patch deadline
- Nov 14, 2025
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Answering about CVE-2025-59287 ·
Questions about CVE-2025-59287
Is CVE-2025-59287 being exploited?
Yes. CISA added CVE-2025-59287 to its Known Exploited Vulnerabilities catalog on Oct 24, 2025, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2025-59287?
Install Microsoft's security update for Windows. If no update exists, follow the vendor's workaround or stop using the product until one ships. Turn on automatic updates for the operating system and for Office, PDF and archive apps.
Am I affected by CVE-2025-59287?
Only if you use Microsoft Windows. This one is aimed at devices or apps of the kind people own.