EUVD-2026-44046
GHSA-x25h-v5pq-j424
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable unauthenticated SSTP service (AV:N/PR:N/UI:N) with full RCE impact (C/I/A:H); use-after-free needs timing and heap conditions, so AC: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
2DescriptionCVE.org
Use after free in Windows Secure Socket Tunneling Protocol (SSTP) allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in the Windows Secure Socket Tunneling Protocol (SSTP) component lets an unauthenticated network attacker run arbitrary code by triggering a use-after-free (CWE-416) memory-corruption condition. The flaw spans a broad range of Windows client and server builds, from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to a Windows system running the SSTP protocol handler - most directly an SSTP VPN endpoint accepting connections on HTTPS/TCP 443 - so the key limiting factor is that the target must have SSTP enabled and exposed rather than SSTP being on by default for every Windows install. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 8.1 (High) with vector AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - network-reachable and unauthenticated (PR:N, UI:N) with full high impact to C/I/A, but AC:H means exploitation requires winning a race or meeting specific memory-layout timing conditions rather than a single deterministic request. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who can reach a Windows host exposing SSTP over the network (for example an SSTP VPN gateway listening on TCP/443) sends a crafted sequence of SSTP protocol messages designed to free an internal object and then reference it, grooming the heap so the freed allocation is reclaimed with attacker-controlled data. By repeatedly attempting to win the required timing race (AC:H), the attacker corrupts memory to achieve arbitrary code execution in the service context. … |
| Remediation | Patch available per vendor advisory: Microsoft has released fixes, so apply the relevant monthly cumulative/security update for each affected build as listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50694 (exact per-build KB versions were not included in this input and should be taken from that page). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and categorize all affected systems (Windows 10 version 1607+, Windows 11, Windows Server 2012 through 2025) using your endpoint management tools and classify by business risk. …
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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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