EUVD-2026-43976
GHSA-p6w8-298r-9237
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Remotely reachable and unauthenticated (AV:N/PR:N/UI:N) but heap-overflow exploitation depends on memory state/timing outside attacker control (AC:H); code execution on a DC yields full C:H/I:H/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Active Directory Domain Services allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Active Directory Domain Services (AD DS) allows an unauthenticated network attacker to corrupt heap memory and run arbitrary code on affected domain controllers. The flaw (CVE-2026-49164, CVSS 8.1) spans a broad range of Windows client and server builds from Windows 10 1607 and Server 2012 through Windows 11 26H1 and Server 2025, with full confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to a Windows domain controller running the Active Directory Domain Services role and the ability to reach the vulnerable AD DS protocol handler; per the CVSS vector (PR:N, UI:N) no authentication or user interaction is needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are mixed and should be weighed rather than taken at face value. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network access to a domain controller sends a specially crafted request to an AD DS protocol endpoint that triggers the heap-based buffer overflow, corrupting memory in the directory service process. By carefully shaping the heap and repeating the attempt to satisfy the high-complexity timing/state conditions, the attacker achieves arbitrary code execution in the context of AD DS, effectively compromising the domain controller. … |
| Remediation | Apply the Microsoft security update for CVE-2026-49164 as the primary and authoritative fix - Patch available per vendor advisory; obtain the exact per-build KB and patched version from the Microsoft Security Response Center guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49164 and deploy it to all domain controllers and affected Windows systems first, prioritizing broadly reachable DCs. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and inventory all domain controllers and Windows servers running Server 2012 through Server 2025, plus Windows 10/11 systems vulnerable to CVE-2026-49164; coordinate with infrastructure and operations teams to prepare emergency patching procedures. …
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External POC / Exploit Code
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