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Windows iSCSI Target CVE-2026-69839

| EUVDEUVD-2026-73060 MEDIUM
Uncaught Exception (CWE-248)
2026-09-08 secure@microsoft.com GHSA-6pcm-j3qf-mrjq
6.5
CVSS 3.1 · Vendor: microsoft
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Severity by source

Vendor (microsoft) PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

Network-reachable service requires authenticated low-privilege access; crash yields availability-only impact with no confidentiality or integrity effect.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
Metadata Corrected
Sep 09, 2026 - 08:40 vuln.today
tag: Information Disclosure replaced by Denial Of Service
Analysis Generated
Sep 09, 2026 - 08:22 vuln.today
Patch available
Sep 08, 2026 - 18:35 EUVD
CVE Published
Sep 08, 2026 - 18:19 cve.org
MEDIUM 6.5

DescriptionCVE.org

Uncaught exception in Windows iSCSI Target Service allows an authorized attacker to deny service over a network.

AnalysisAI

Denial of service in the Windows iSCSI Target Service affects authenticated network users on Windows Server 2012 through 2025 and Windows 10 versions 1607 and 1809. An authorized low-privileged attacker can send a crafted network request that triggers an uncaught exception (CWE-248) in the iSCSI Target Service process, causing the service to terminate and disrupting storage connectivity for all iSCSI initiators connected to that target. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
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Delivery
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Exploit
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Install
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C2
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Execute
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to hold valid credentials providing at minimum low-level authenticated access to the target system or network (PR:L per CVSS vector). … 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:N/I:N/A:H accurately characterizes this vulnerability: network-accessible, low complexity, requires low-level authenticated access, no user interaction, and produces 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 Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the vendor-released patches via Windows Update or WSUS targeting each affected build: Windows Server 2012/2012 R2 patches through the Extended Security Updates program (build thresholds 6.2.9200.26349 and 6.3.9600.23397 respectively), Windows Server 2016/Windows 10 1607 to build 10.0.14393.9512, Windows Server 2019/Windows 10 1809 to build 10.0.17763.9245, Windows Server 2022 to build 10.0.20348.5622, and Windows Server 2025 to build 10.0.26100.33438. … Detailed patch versions, workarounds, and compensating controls in full report.

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CVE-2026-69839 vulnerability details – vuln.today

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