EUVD-2026-56320
GHSA-fq87-fvf6-2354
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privilege access required to reach TAPISRV; heap overflow is directly triggerable with no interaction, yielding full SYSTEM-level C/I/A impact within the unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Telephony Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in the Windows Telephony Service (TAPISRV) enables a locally authenticated, low-privileged attacker to escalate privileges to SYSTEM on a broad range of Windows client and server releases spanning Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. The vulnerability carries a CVSS 7.8 score with low attack complexity, meaning exploitation is straightforward once local access is established, making it an effective second-stage tool in a broader attack chain. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid, low-privileged local account or process on the target Windows system (CVSS PR:L, AV:L) - unauthenticated or remote-only attackers cannot exploit this vulnerability directly. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately characterizes a local privilege escalation with low attack complexity and no user interaction required. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply Microsoft's security update for CVE-2026-61353 via Windows Update, Windows Server Update Services (WSUS), or the Microsoft Update Catalog, referencing the official advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61353. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct complete inventory of all Windows systems running affected versions (Windows Server 2012-2025, Windows 11 26H1) and prioritize by business criticality and server role. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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