EUVD-2026-73256
GHSA-gx72-ccm9-4rjh
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network RCE (AV:N/PR:N/UI:N) with total impact, but UAF race exploitation and the non-default ICS-enabled requirement justify AC:H over Microsoft's AC:L.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Use after free in Windows Internet Connection Sharing (ICS) allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in the Windows Internet Connection Sharing (ICS) service stems from a use-after-free (CWE-416) that a network attacker can trigger without authentication or user interaction. Every supported Windows client and server branch is affected, from Windows Server 2012 through Windows 11 25H2 and Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target Windows host to have the Internet Connection Sharing (ICS) feature enabled and its service reachable over the network - ICS is not enabled by default, which is the primary limiting factor that shrinks the real-world attack surface. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The Microsoft CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N, C:H/I:H/A:H, base 9.8) portrays a trivially exploitable unauthenticated network RCE, and SSVC reinforces concern with Automatable:yes and Technical Impact:total. … 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-2026-72983 for your specific Windows build to at least the fixed version listed for that branch (e.g. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows Server 2012-2025 and Windows 11 systems (including 25H2) to identify ICS service dependencies; prioritize domain controllers, network infrastructure, and multi-homed servers handling remote access. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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