EUVD-2026-73363
GHSA-5p78-53fg-gmxp
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
KDC listens on port 88 with no auth required per description; crash impact is availability-only with no confidentiality or integrity exposure.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
5DescriptionCVE.org
Out-of-bounds read in Windows Key Distribution Center allows an unauthorized attacker to deny service over a network.
AnalysisAI
Out-of-bounds read in the Windows Key Distribution Center (KDC) allows unauthenticated network attackers to crash the Kerberos authentication service by sending a specially crafted packet to port 88, resulting in a denial of service condition. The vulnerability spans the entire supported Windows Server portfolio from Server 2012 through Server 2025, as well as Windows 10 and 11 client builds, confirmed by EUVD-2026-73363. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target system must be a Windows Domain Controller actively running the KDC role - this role is present on all DCs by default and is not configurable to disable without demoting the DC. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (7.5) accurately captures the attack profile: the KDC is network-reachable without authentication, exploitation requires no special conditions, and impact is confined to availability. … 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 updates via Windows Update, WSUS, or Microsoft Update Catalog targeting the patched builds confirmed in EUVD-2026-73363: Windows Server 2025 to build 10.0.26100.33438 or later, Windows Server 2022 to 10.0.20348.5622 or later, Windows Server 2019 and Windows 10 1809 to 10.0.17763.9245 or later, Windows Server 2016 and Windows 10 1607 to 10.0.14393.9512 or later, Windows Server 2012 R2 to 6.3.9600.23397 or later, and Windows Server 2012 to 6.2.9200.26349 or later; for Windows 11 and Windows 10 21H2/22H2, apply the corresponding builds listed in the advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows KDC infrastructure in your environment (domain controllers running Server 2012-2025) and assess network exposure to port 88 from untrusted sources. …
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External POC / Exploit Code
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