EUVD-2026-56742
GHSA-xpf7-rv52-62vr
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack requiring low-privileged account with no user interaction; full C/I/A impact consistent with privilege escalation to SYSTEM; unchanged scope as compromise is contained to the target host.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
7DescriptionNVD
Integer overflow or wraparound in Windows DNS allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows DNS affects every major Windows 10, 11, and Windows Server release from 2012 through 2025, allowing a locally authenticated low-privileged attacker to achieve full system compromise through a heap-based buffer overflow triggered by integer wraparound. The CVSS base score of 7.8 reflects total C/I/A impact and low attack complexity once local access exists. …
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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 user account on the target Windows system - confirmed by CVSS PR:L and the Microsoft description's use of 'authorized attacker.' Remote unauthenticated exploitation is explicitly excluded by the AV:L vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.8 with AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H reflects a straightforward local privilege escalation requiring only a standard user account and no user interaction, with low attack complexity once access is established. … 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 available through Windows Update or the Microsoft Update Catalog, as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65799. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, coordinate with infrastructure teams to identify all Windows 10, 11, and Server 2012-2025 systems, prioritizing domain controllers, DNS servers, and systems storing sensitive data. …
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View allSame technique Heap Overflow
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External POC / Exploit Code
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