EUVD-2026-43761
GHSA-2q6g-jrff-pxhq
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attacker requires low-privilege domain authentication to reach AD DS over network; crash impact is availability-only with no confidentiality or integrity consequence.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionCVE.org
Null pointer dereference in Active Directory Domain Services allows an authorized attacker to deny service over a network.
AnalysisAI
Null pointer dereference in Windows Active Directory Domain Services (AD DS) enables a low-privileged authenticated attacker to crash the service remotely, causing denial of service across the affected domain. The flaw spans a wide range of Windows client and server releases, from Windows 10 version 1607 through Windows 11 version 26H1 and Windows Server 2012 through 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold a valid low-privilege credential within the domain or network context sufficient to authenticate and send requests to Active Directory Domain Services - consistent with the CVSS PR:L metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 6.5 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) reflects a realistic threat model: network-reachable, low complexity, low privilege, no user interaction required, and high availability impact with no confidentiality or integrity loss. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged domain user or service account holder connects to a domain controller over the network and submits a specially crafted request to the Active Directory Domain Services interface, triggering a null pointer dereference in the AD DS process. The service crashes, causing the domain controller to become unavailable for authentication and LDAP queries, potentially locking out users and disrupting services relying on Active Directory across the environment until the service is restarted or the system reboots. … |
| Remediation | Microsoft has released a patch for this vulnerability; apply the relevant cumulative update for each affected Windows version as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57976. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-476 – NULL Pointer Dereference
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External POC / Exploit Code
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