EUVD-2026-22522
GHSA-49pj-8x2g-xv47
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
6DescriptionCVE.org
Heap-based buffer overflow in Function Discovery Service (fdwsd.dll) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in Microsoft Windows Function Discovery Service (fdwsd.dll) enables low-privileged authenticated local attackers to escalate privileges to SYSTEM across Windows 10, Windows 11, and Windows Server 2012-2025. Vendor-released patch available per Microsoft Security Response Center advisory. No public exploit identified at time of analysis, though the CVSS vector indicates local access with high attack complexity (AC:H), requiring authenticated low-privilege users (PR:L). A
Technical ContextAI
The vulnerability resides in the Function Discovery (FD) Service component (fdwsd.dll), a Windows system service responsible for discovering network devices and services through protocols like WS-Discovery, UPnP, and SSDP. CWE-122 identifies this as a heap-based buffer overflow, occurring when the service writes data beyond allocated heap memory boundaries during processing operations. Unlike stack-based overflows, heap corruption vulnerabilities typically require more sophisticated exploitation techniques due to non-deterministic memory layouts and heap metadata manipulation requirements, aligning with the CVSS AC:H (high complexity) rating. The Function Discovery Service runs with elevated privileges in the Windows service architecture, making successful exploitation a direct path to SYSTEM-level access. Affected CPE strings confirm impact spans Windows 10 (versions 1607 through 22H2), Windows 11 (22H3 through 26H1), and Windows Server platforms from 2012 through 2025, including Server Core installations that lack GUI management interfaces.
RemediationAI
Apply vendor-released security updates immediately through Windows Update, WSUS, or Microsoft Update Catalog. Microsoft has published patches addressing CVE-2026-32087 with specific fixed versions: Windows Server 2016 10.0.14393.9060 or later, Windows Server 2012 R2 6.3.9600.23132 or later, Windows Server 2012 6.2.9200.26026 or later, Windows 10 Version 1809 10.0.17763.8644 or later, Windows Server 2022 23H2 Edition 10.0.25398.2274 or later, Windows 10 Version 1607 10.0.14393.9060 or later, Windows 11 version 26H1 10.0.28000.1836 or later, Windows 10 Version 22H2 10.0.19045.7184 or later, Windows Server 2025 10.0.26100.32690 or later, Windows 10 Version 21H2 10.0.19044.7184 or later, Windows 11 Version 25H2 10.0.26200.8246 or later, Windows Server 2019 10.0.17763.8644 or later, Windows 11 Version 24H2 10.0.26100.32690 or later, Windows 11 Versions 23H2
Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
Leaving vuln.today