EUVD-2026-56401
GHSA-q8hj-9894-q2w9
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable pre-auth SSTP service justifies AV:N and PR:N; double free exploitation requires precise conditions, warranting AC:H; full system compromise if successful yields C:H/I:H/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Double free in Windows Secure Socket Tunneling Protocol (SSTP) allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution via double free (CWE-415) in the Windows Secure Socket Tunneling Protocol (SSTP) service enables a network-adjacent, unauthenticated attacker to corrupt heap memory and execute arbitrary code. The vulnerability spans virtually every supported Windows Server and Windows 10/11 release, from Server 2012 through Server 2025 and Windows 11 26H1, making the remediation footprint extremely broad. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The SSTP service must be actively running and reachable from the attacker over the network - in practice, this means a Windows Server with RRAS configured to accept SSTP VPN connections, typically listening on TCP/443. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 8.1 reflects a high-impact but technically demanding vulnerability: AV:N (network reachable), AC:H (high complexity - exploitation requires meeting specific conditions), PR:N (no authentication needed), and C:H/I:H/A:H (full triad compromise if exploited). … 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 corresponding to the installed Windows build - the fixed build versions are enumerated in the affected products field above and are obtainable via Windows Update, WSUS, or the Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all Windows Server 2012-2025 and Windows 10/11 systems to identify SSTP service enablement and document the inventory by criticality tier. …
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Same weakness CWE-415 – Double Free
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External POC / Exploit Code
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