EUVD-2026-56371
GHSA-jq98-jfg2-p3r2
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local service exploitation by a low-privileged user with no interaction yields full system compromise; AV:L and PR:L align with the 'authorized attacker' framing in the description.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Device Association Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Windows Device Association Service contains a heap-based buffer overflow (CWE-122) that enables local privilege escalation on a broad swath of Windows client and server editions, from Windows 10 1607 through Windows 11 26H1 and Windows Server 2016 through 2025. An attacker holding a standard low-privileged local account can exploit this flaw without any user interaction, achieving high impact across confidentiality, integrity, and availability - consistent with full SYSTEM-level compromise. No public exploit has been identified at time of analysis, and no CISA KEV listing is present, but Microsoft has released patches and the low attack complexity (AC:L) makes this a reliable privilege escalation primitive once local foothold is established.
Technical ContextAI
The Windows Device Association Service (DeviceAssociationService) is a core Windows component responsible for managing device pairing relationships, including Bluetooth, Wi-Fi Direct, and networked device associations. CWE-122 (Heap-based Buffer Overflow) indicates that attacker-supplied input causes a write beyond the bounds of a heap-allocated buffer, enabling corruption of adjacent heap metadata or function pointers. This class of vulnerability in a privileged Windows service is a well-understood mechanism for privilege escalation: by corrupting control-flow data or exploiting heap management structures, an attacker running as a low-privileged user can redirect execution into attacker-controlled code running at a higher integrity level. The affected product range, confirmed by EUVD data, spans 15 distinct Windows SKUs and build branches across both client (Windows 10/11) and server (Server 2016/2019/2022/2025) lines, all sharing the same vulnerable service code.
RemediationAI
Apply Microsoft's released patches for all affected Windows editions, targeting the fixed build numbers confirmed by EUVD: Windows Server 2025 and Server Core should be updated to build 10.0.26100.33296 or later; Windows 11 23H2 to 10.0.22631.7517 or later; Windows Server 2019 and 1809 to 10.0.17763.9115 or later; Windows 10 1607 and Server 2016 to 10.0.14393.9418 or later; Windows 10 21H2 to 10.0.19044.7663 or later; Windows Server 2022 to 10.0.20348.5499 or later; Windows 11 26H1 to 10.0.28000.2704 or later; Windows 11 24H2 to 10.0.26100.9168 or later; and Windows 11 25H2 to 10.0.26200.9168 or later. Patching should be prioritized on systems accessible via RDP, terminal services, or any environment where untrusted or low-privileged users can execute code locally. As a compensating control where immediate patching is not possible, consider restricting local interactive logon rights to trusted accounts via Group Policy (User Rights Assignment), disabling or restricting access to the Device Association Service on systems that do not require device pairing functionality (note: this may break Bluetooth and Wi-Fi Direct device pairing), and deploying application allowlisting to limit post-exploitation code execution. Full details at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62747.
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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
Leaving vuln.today