EUVD-2026-56741
GHSA-ffhc-m8m2-6rjw
Severity by source
AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Local vector and high privileges required because exploitation depends on existing admin-level local access to trigger the DNS heap overflow.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Numeric truncation error in Windows DNS allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in the Windows DNS service affects a broad range of Windows client and server versions from Windows Server 2012 through Windows Server 2025 and Windows 10/11 across all major feature releases. The vulnerability stems from a numeric truncation error (CWE-122, heap-based buffer overflow) that an already-privileged local attacker can trigger to gain elevated access beyond their current privilege level. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already hold high local privileges (PR:H per CVSS vector) on the target Windows system - this is explicitly described as an 'authorized attacker' in the CVE description, meaning unauthenticated or low-privilege exploitation is not applicable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 6.7 (Medium-High) reflects a meaningful but bounded threat posture. … 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 Microsoft security update addressing CVE-2026-65797, available via the Microsoft Security Response Center at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65797. … Detailed patch versions, workarounds, and compensating controls in full report. |
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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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