EUVD-2026-56726
GHSA-rgxm-h63h-pg7w
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network vector confirmed by iSCSI protocol; AC:H reflects heap exploitation complexity; PR:N because iSCSI Target authenticates at storage level, not OS user level; full C/I/A impact from code execution.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows iSCSI Target Service allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution via heap-based buffer overflow in the Windows iSCSI Target Service affects a broad range of Windows Server versions from Server 2012 through Server 2025, as well as Windows 10 (versions 1607 and 1809). An unauthenticated network attacker can send a malformed iSCSI protocol request to trigger CWE-122 heap corruption and achieve arbitrary code execution on the target host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The Windows iSCSI Target Service (Microsoft iSCSI Target Server role) must be installed and running - this is a non-default Windows Server role that must be explicitly added via Server Manager or PowerShell. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 8.1 places this in the High tier, but the AC:H metric is a meaningful signal: heap exploitation over a network protocol typically demands precise heap grooming, timing, or multi-step interaction to reliably control the overflow. … 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 patches from Microsoft, which address this vulnerability across all affected product lines; exact patched build numbers per product are listed in the affected products field above and the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65679. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows Server 2012 through 2025 and Windows 10 (versions 1607, 1809) systems with the iSCSI Target Service role enabled, and assess network exposure by identifying which systems are directly reachable from untrusted networks. …
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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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