EUVD-2026-43983
GHSA-4q9f-cg77-mm2c
Severity by source
AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
Local authenticated user (AV:L/PR:L) exploiting a race-based UAF needing user interaction (AC:H/UI:R) crosses a privilege boundary (S:C) for full code-execution impact (C/I/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Microsoft Windows Speech allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege elevation in the Windows Speech component (Text-to-Speech / speech runtime) affects a broad range of Windows 10, Windows 11, and Windows Server releases, where a use-after-free (CWE-416) lets an already-authenticated local user corrupt memory to run code at higher privilege. Exploitation is non-trivial - it requires local access, low-level authentication, user interaction, and winning a memory-timing condition - and the CVSS 7.5 rating reflects a scope-changed, high-impact outcome. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must be a locally authenticated, low-privileged user on the target Windows system (AV:L, PR:L) - no remote or unauthenticated path exists. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H yields 7.5 (High) and paints a nuanced picture: full CIA impact (C:H/I:H/A:H) and a scope change drive the score up, but three mitigating gates hold it below critical - local-only access (AV:L), high attack complexity (AC:H, implying a race/timing condition typical of use-after-free), and required user interaction (UI:R). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a low-privileged foothold on a Windows host (e.g., a standard user account or a compromised service) triggers the vulnerable Speech code path and induces the use-after-free, then wins the memory-reallocation race to hijack the dangling pointer and execute code at elevated privilege. Because AC:H and UI:R apply, the attacker likely must also get a logged-on user to perform a specific action and may need multiple attempts to hit the timing window. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-49171 referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49171, selecting the cumulative update matching each affected build (Windows 10 1607/1809/21H2/22H2, Windows 11 24H2/25H2/26H1, and Windows Server 2016/2019/2022/2025 including Server Core). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all affected Windows 10, 11, and Windows Server systems, prioritizing those used by privileged users and systems handling sensitive operations. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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