EUVD-2026-43856
GHSA-c7hq-7wfr-2j8f
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable WSUS listener needs no auth or user interaction (AV:N/AC:L/PR:N/UI:N); an uncaught exception crashes the service, giving availability-only impact (A:H, C:N/I:N).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionCVE.org
Uncaught exception in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.
AnalysisAI
Denial of service in Microsoft Windows Server Update Services (WSUS) lets a remote, unauthenticated attacker crash or disrupt the update service by triggering an uncaught exception over the network. The flaw affects WSUS across Windows Server 2012 through 2025 (plus Windows 10 1607/1809 servicing components), and the CVSS 3.1 availability-only vector (A:H) indicates service unavailability rather than data compromise. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to a running WSUS server instance on an affected Windows Server (2012 through 2025) - the WSUS role must be installed and its client/management listener (default TCP 8530/8531) reachable from the attacker. … 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:N/UI:N/S:U/C:N/I:N/A:H yields 7.5 (High), driven entirely by availability impact - an attacker can crash the service with low complexity, no privileges, and no user interaction, with no confidentiality or integrity loss per the vector. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network reachability to a WSUS server sends a crafted request to its client- or management-facing endpoint that triggers the unhandled exception, terminating the WSUS service and halting update distribution to all managed clients. Because the CVSS vector is AV:N/AC:L/PR:N/UI:N, no credentials, user interaction, or complex setup are required, and repeated requests could sustain the outage. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50328; Patch available per vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50328, though the exact fixed KB/build is not in the provided data and must be pulled from that MSRC page for your specific Windows Server version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all WSUS server instances running versions 2012 through 2025, document current patch levels, and assess network exposure to untrusted networks. …
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External POC / Exploit Code
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