KEV Intelligence

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2025-59287

Windows Server Update Service (WSUS) Remote Code Execution Vulnerability

Microsoft / Windows Server 2012 · affected before 6.2.9200.25728

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Severity
CVSS 9.8 · Critical
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
99.9%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2025-59287 is an unauthenticated Windows Server Update Service (WSUS) Remote Code Execution Vulnerability affecting Microsoft Windows Server 2012 and 12 other products. Deserialization of untrusted data in Windows...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Microsoft / Windows Server 2012 affected before 6.2.9200.25728.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Windows Server Update Service (WSUS) Remote Code Execution Vulnerability

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

Vendor Product Affected Status
Microsoft Windows Server 2012 Before 6.2.9200.25728 Affected
Microsoft Windows Server 2012 (Server Core installation) Before 6.2.9200.25728 Affected
Microsoft Windows Server 2012 R2 Before 6.3.9600.22826 Affected
Microsoft Windows Server 2012 R2 (Server Core installation) Before 6.3.9600.22826 Affected
Microsoft Windows Server 2016 Before 10.0.14393.8524 Affected
Microsoft Windows Server 2016 (Server Core installation) Before 10.0.14393.8524 Affected
Microsoft Windows Server 2019 Before 10.0.17763.7922 Affected
Microsoft Windows Server 2019 (Server Core installation) Before 10.0.17763.7922 Affected
Microsoft Windows Server 2022 Before 10.0.20348.4297 Affected
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) Before 10.0.25398.1916 Affected
Microsoft Windows Server 2025 Before 10.0.26100.6905 Affected
Microsoft Windows Server 2025 (Server Core installation) Before 10.0.26100.6905 Affected
View vendor advisory (opens in new tab)
Published
14 Oct 2025
Exploitation Reported
01 Jun 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

cisa nuclei_scanner windows microsoft

CVE References

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 01 Jun 2026

Independent exploitation attestation added to the KEV Intelligence record.

Proof of concept available

Nuclei Templates

Recorded 12 Jun 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source Added
CVE First 2026-06-01 10:42 UTC
CISA 2026-06-02 14:05 UTC
The Shadowserver 2026-06-04 00:00 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0

Raw values available in Pro and Enterprise.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-59287.yaml 01 Jun 2026

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

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

EPSS

99.9%

Weaknesses

Deserialization of Untrusted Data CWE-502

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

Windows Server Update Service - Insecure Deserialization

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. Public PoC available

    Public proof-of-concept code published

  2. KEV confirmed by The Shadowserver

    Exploitation attested by an external source

  3. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  4. Nuclei template available

    Scanner coverage available

  5. Added to KEV Intelligence KEV Feed

    High-confidence, third-party attested exploitation

  6. CVE published

    Vulnerability disclosed publicly

  7. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2025-59287

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2025-59287",
  "confidence": "Confirmed",
  "cvss_score": 9.8,
  "cvss_estimated": false,
  "epss_score": 0.99938,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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