EUVD-2026-44297
GHSA-x3r5-2fxh-hp4j
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local elevation requiring an existing low-privileged session (AV:L, PR:L), no user interaction, straightforward trigger (AC:L), yielding full SYSTEM compromise (C:H/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
Heap-based buffer overflow in Universal Plug and Play (upnp.dll) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows UPnP Device Host service (upnp.dll) lets an already-authenticated low-privileged user corrupt heap memory to gain SYSTEM-level control across a broad range of Windows 10, Windows 11, and Windows Server 2019-2025 builds. Reported by Microsoft with a patch available, it carries CVSS 7.8 (local, low-complexity, low-privilege). There is no public exploit identified at time of analysis, EPSS is low (0.36%), and CISA SSVC records exploitation as none.
Technical ContextAI
Universal Plug and Play (UPnP) is a set of networking protocols implemented on Windows through the upnp.dll library and the associated UPnP Device Host / SSDP Discovery services, which handle device advertisement and control locally. The root cause is CWE-122, a heap-based buffer overflow: a size or bounds miscalculation while processing attacker-influenced data causes a write past the end of a heap allocation, corrupting adjacent heap structures. Because upnp.dll runs in the context of a privileged service, controlled corruption of that heap can be steered toward attacker-chosen code paths, yielding elevation of privilege rather than a mere crash. The affected CPEs enumerate Microsoft Windows 10 (1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2019, 2022, and 2025 including Server Core installations.
RemediationAI
Apply the Microsoft security update for CVE-2026-58547 (patch available per vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58547), bringing systems to at least the fixed builds: Windows 10 1809 / Server 2019 to 10.0.17763.9020, Windows 10 21H2 to 10.0.19044.7548, Windows 10 22H2 to 10.0.19045.7548, Windows 11 24H2/25H2 to 10.0.26100.8875, Windows 11 26H1 to 10.0.28000.2525, Windows Server 2022 to 10.0.20348.5386, and Windows Server 2025 to 10.0.26100.33158. Where patching must be deferred, reduce exposure by stopping and disabling the SSDP Discovery (SSDPSRV) and UPnP Device Host (upnphost) services on systems that do not require UPnP - a low-impact change on servers and most enterprise workstations, though it will break local media streaming, device discovery, and any application relying on UPnP. Because this is a local elevation-of-privilege flaw, also enforce least privilege and restrict interactive and low-privileged local access to reduce the pool of attackers able to reach the vulnerable service.
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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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