EUVD-2026-44140
GHSA-c9q6-72fq-24hj
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
Network-reachable AD service, low complexity, but requires valid low-privileged credentials (PR:L); impact is primarily availability (A:H) with a minor OOB-read confidentiality leak (C:L) and no integrity effect.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
Lifecycle Timeline
2DescriptionCVE.org
Out-of-bounds read in Windows Active Directory allows an authorized attacker to deny service over a network.
AnalysisAI
Denial of service in Windows Active Directory allows an authenticated network attacker to crash or degrade the directory service via an out-of-bounds read (CWE-125). The flaw affects Active Directory across Windows 10 (21H2/22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2022/2025 including Server Core; there is no public exploit identified at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already hold valid low-privileged domain credentials (CVSS PR:L - authenticated), and network reachability to the Active Directory service on a domain controller. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H (base 7.1) describes a low-complexity, network-reachable attack requiring only low privileges and no user interaction, with high availability impact and minor confidentiality impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained low-privileged domain credentials (for example a compromised standard user account) sends a specially crafted request over the network to a domain controller, triggering the out-of-bounds read and crashing or hanging the Active Directory service. With the DC unavailable, domain authentication and directory lookups fail across the environment. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50682 for each affected Windows and Windows Server build, prioritizing domain controllers first since they run the exposed Active Directory service. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 10 (21H2/22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2022/2025 instances in your environment and prioritize domain controllers and critical AD infrastructure by business criticality. …
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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