EUVD-2026-44133
GHSA-9q4m-9fw8-gjgv
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Requires an existing low-privileged local foothold (AV:L, PR:L) with no user interaction and low complexity, yielding full SYSTEM-level compromise (C/I/A:H) without scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Integer overflow or wraparound in Windows Active Directory allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Active Directory across a broad range of Windows client and server releases (Windows 10 1607 through Windows 11 26H1, and Windows Server 2012 through 2025) allows an authenticated local attacker to elevate privileges by triggering an integer overflow (CWE-190). Successful exploitation yields high confidentiality, integrity, and availability impact, effectively enabling escalation to SYSTEM-level control on the affected host. There is no public exploit identified at time of analysis, and it is not listed in CISA KEV; Microsoft has issued a patch via MSRC.
Technical ContextAI
The flaw resides in the Active Directory component of Windows, which underpins domain identity, authentication, and directory services on both domain controllers and member systems. The root cause is CWE-190 (integer overflow or wraparound): a length, size, or index calculation wraps past its maximum value, producing an undersized allocation or an out-of-bounds condition that corrupts adjacent memory - consistent with the 'Buffer Overflow' and 'Integer Overflow' tags in the intelligence. The CPE data confirms this is native Microsoft Windows code spanning Windows 10 (1607, 1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2012 through Windows Server 2025, indicating a long-standing code path shared across the OS family rather than a single-release regression.
RemediationAI
Patch available per vendor advisory: apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54115, selecting the KB corresponding to each affected Windows 10/11 or Windows Server 2012-2025 build (including Server Core installations). Exact fixed build numbers are enumerated in the MSRC update guide and should be pulled from there rather than assumed. Prioritize domain controllers and any systems running Active Directory roles, then member servers and clients. Because exploitation requires an existing authenticated local foothold, interim compensating controls focus on limiting who can run code on affected hosts: restrict and audit local/interactive logon rights and administrative access on domain controllers, enforce least privilege for service and user accounts, and monitor for anomalous local privilege-escalation behavior via EDR - with the trade-off that these reduce but do not eliminate exploitability and are not a substitute for the update.
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Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Buffer Overflow
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External POC / Exploit Code
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