EUVD-2026-56654
GHSA-8c26-rjfq-877q
Severity by source
AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Local access and high-privilege requirement confirmed by description and CVSS input; heap overflow yields full C/I/A within the DNS process; no scope change as exploitation does not cross trust boundaries.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Numeric truncation error in Windows DNS allows an authorized attacker to elevate privileges locally.
AnalysisAI
Windows DNS Server on a broad range of Windows and Windows Server editions contains a heap-based buffer overflow rooted in a numeric truncation error, enabling an authorized local attacker with high-privilege access to escalate privileges on the affected system. Affected platforms span Windows Server 2012 through Server 2025 and Windows 10/11 across multiple feature versions, with Microsoft confirming full confidentiality, integrity, and availability impact upon successful exploitation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CVSS vector (AV:L/PR:H) explicitly requires local system access with high-privilege credentials. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 6.7 (Medium-High) is shaped primarily by the local attack vector (AV:L) and high-privilege prerequisite (PR:H), both of which substantially constrain real-world exploitability relative to the total technical impact (C:H/I:H/A:H). … 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 updates as detailed in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62769. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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