Critical 9.8Known exploited (CISA KEV)Published Oct 14, 2025

CVE-2025-59287Windows Server Update Service (WSUS) Remote Code Execution Vulnerability

Updated under an hour ago (Oct 27, 2026, 12:40 PM ET)

Does this affect you?

It affects Microsoft Windows Server 2012 and 6 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Oct 24, 2025; federal agencies had to remediate by Nov 14, 2025. Treat that date as your deadline.

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Every CVE for Microsoft Windows Server 2012

Exploited in the last 30 days

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

CVSS: 9.8 CRITICAL (v3.1, CNA)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
Weakness (CWE): CWE-502
Known exploited: Added to CISA KEV Oct 24, 2025; federal remediation due Nov 14, 2025Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 99.98% (percentile 100)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Feb 26, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Windows Server 2012 microsoft:windows_server_2012 (from the name)	from 6.2.9200.0 before 6.2.9200.25728	CNA record
Microsoft Windows Server 2012 R2 microsoft:windows_server_2012_r2 (from the name)	from 6.3.9600.0 before 6.3.9600.22826	CNA record
Microsoft Windows Server 2016 microsoft:windows_server_2016 (from the name)	from 10.0.14393.0 before 10.0.14393.8524	CNA record
Microsoft Windows Server 2019 microsoft:windows_server_2019 (from the name)	from 10.0.17763.0 before 10.0.17763.7922	CNA record
Microsoft Windows Server 2022 microsoft:windows_server_2022 (from the name)	from 10.0.20348.0 before 10.0.20348.4297	CNA record
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) microsoft:windows_server_2022_23h2	from 10.0.25398.0 before 10.0.25398.1916	CNA record
Microsoft Windows Server 2025 microsoft:windows_server_2025 (from the name)	from 10.0.26100.0 before 10.0.26100.6905	CNA record
microsoft windows_server_2012 microsoft:windows_server_2012	all versions; r2	NVD
microsoft windows_server_2016 microsoft:windows_server_2016	before 10.0.14393.8524	NVD
microsoft windows_server_2019 microsoft:windows_server_2019	before 10.0.17763.7922	NVD
1–10 of 13

References

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59287	vendor-advisory, patch
https://hawktrace.com/blog/CVE-2025-59287	exploit, third-party-advisory
https://www.bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-windows-server-wsus-flaw-exploited-in-attacks/	press/media-coverage
https://www.vicarius.io/vsociety/posts/cve-2025-59287-detection-script-rce-vulnerability-in-windows-server-update-service	third-party-advisory
https://www.vicarius.io/vsociety/posts/cve-2025-59287-mitigation-script-rce-vulnerability-in-windows-server-update-service	mitigation, third-party-advisory
https://gist.github.com/hawktrace/880b54fb9c07ddb028baaae401bd3951	third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59287	third-party-advisory, us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.