Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access and low-privilege account required; race condition exploitation is inherently high complexity; full C/I/A reflects SYSTEM-level code execution with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Telephony Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in the Windows Telephony Service (TapiSrv) allows an authenticated local attacker with low-privilege access to gain SYSTEM-level privileges by exploiting a race condition in how the service handles concurrent access to shared resources. Affected products span Windows 10 (multiple feature releases), Windows 11, and Windows Server 2012 through 2025, representing a broad swath of the Microsoft ecosystem. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local session with at minimum a low-privilege (standard user) account on the target Windows system; this is confirmed by CVSS PR:L and AV:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 7.0 with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H accurately characterizes a moderate-to-high severity local privilege escalation. … 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 the vendor-released patch distributed through the Microsoft Security Response Center at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62727. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 10, Windows 11, and Windows Server 2012-2025 systems in your environment to determine exposure scope. …
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Same weakness CWE-362 – Race Condition
View allSame technique Information Disclosure
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-63093
GHSA-p2p4-x525-922v