CVE-2025-59287

CRITICAL CISA KEV

Published Oct 14, 2025 Modified Nov 12, 2025 CWE-502

Description

Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.

CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Oct 24, 2025 Remediation due: Nov 14, 2025

Weakness Type (CWE)

CWE-502 Deserialization of Untrusted Data

Affected Products

Vendor	Product	Versions
microsoft	windows_server_2012	All
microsoft	windows_server_2012	All
microsoft	windows_server_2016	< 10.0.14393.8524
microsoft	windows_server_2019	< 10.0.17763.7922
microsoft	windows_server_2022	< 10.0.20348.4297
microsoft	windows_server_2022_23h2	< 10.0.25398.1916
microsoft	windows_server_2025	< 10.0.26100.6905

References

Advisories & Patches

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59287

Exploits

https://hawktrace.com/blog/CVE-2025-59287

Other References

https://www.bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-windows-server-wsus-flaw-exploited-in-attacks/ 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 https://gist.github.com/hawktrace/880b54fb9c07ddb028baaae401bd3951 https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59287

Frequently Asked Questions

What is CVE-2025-59287? +

Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network. It has a CVSS v3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2025-59287? +

CVE-2025-59287 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-59287? +

CVE-2025-59287 affects products from microsoft, specifically: windows_server_2012, windows_server_2016, windows_server_2019, windows_server_2022, windows_server_2022_23h2, windows_server_2025. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-59287? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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Quick Facts

CVSS Score: 9.8
Severity: CRITICAL
Published: Oct 14, 2025
KEV: Active Exploit

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