EUVD-2026-56404
GHSA-7vx3-6fg5-pq94
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network-reachable WDS parses attacker input (AV:N/PR:N/UI:N); low-complexity use-after-free yielding code execution gives full C/I/A impact, scope unchanged.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Deployment Services allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Windows Deployment Services (WDS) allows an unauthenticated network attacker to trigger a use-after-free (CWE-416) and run arbitrary code on the affected server. The flaw spans virtually every supported Windows Server release (2012 through 2025) plus Windows 10 clients running the WDS role, and carries a critical CVSS 9.8 (AV:N/AC:L/PR:N/UI:N). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target server has the Windows Deployment Services role installed and running and that the attacker can reach its network-imaging/PXE interface (TFTP/RPC boot services) - WDS is not present on default Windows installations, which is the primary limiting factor. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, 9.8) describes the worst-case profile: remote, low-complexity, unauthenticated, no user interaction, with full confidentiality/integrity/availability impact - consistent with the 'execute code over a network' description and the use-after-free class. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft security update for CVE-2026-62893 - patch available per vendor advisory - bringing systems to at least the fixed builds for each release: Server 2025 10.0.26100.33296, Server 2022 10.0.20348.5499, Server 2019 / Win10 1809 10.0.17763.9115, Server 2016 / Win10 1607 10.0.14393.9418, Server 2012 R2 6.3.9600.23337, and Server 2012 6.2.9200.26279; details and downloads are at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62893. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows Server deployments (2012-2025) running Windows Deployment Services and all Windows 10 systems with the WDS role enabled using your configuration management or asset inventory tools; begin testing Microsoft's latest WDS patches in a non-production environment and establish a priority patch deployment schedule. …
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External POC / Exploit Code
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