EUVD-2026-73365
GHSA-96fm-jjf3-wv64
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated low-privileged user can trigger heap overflow with no interaction; total impact on vulnerable system, no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
6DescriptionCVE.org
Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in the Windows Advanced Local Procedure Call (ALPC) subsystem enables a low-privileged local attacker to elevate privileges to SYSTEM level across a broad range of Windows 10 and Windows Server releases. The flaw (CWE-122) resides in ALPC's message-handling internals, where crafted IPC payloads can corrupt heap memory in a way that redirects execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an existing low-privileged local authenticated session on the target Windows host (AV:L, PR:L); the attacker must be able to execute code on the machine and communicate with ALPC ports locally. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects a low-complexity local privilege escalation with total system impact once triggered by any authenticated low-privileged user - even a mid-sized municipal IT team in sopot operating a mixed Windows Server 2019/2022 estate should treat this as an urgent patching priority, since any compromised standard user account becomes a full SYSTEM-level foothold. … 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-released security update for the relevant Windows version, targeting the build thresholds listed in EUVD-2026-73365: update Windows Server 2022 to build 10.0.20348.5622 or later, Windows Server 2019 / Windows 10 1809 to 10.0.17763.9245 or later, Windows Server 2016 / Windows 10 1607 to 10.0.14393.9512 or later, Windows 10 21H2 to 10.0.19044.7725 or later, Windows 10 22H2 to 10.0.19045.7725 or later, Windows Server 2012 R2 to 6.3.9600.23397 or later, and Windows Server 2012 to 6.2.9200.26349 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, obtain the complete list of Windows 10 and Windows Server versions deployed in your environment and verify Microsoft patch availability for each build. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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