CVE-2026-69521

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Integer Overflow in Windows iSCSI Leads to Remote Code Execution

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description

Integer overflow or wraparound in Windows iSCSI allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-13

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-69521

EUVD

EUVD-2026-99270

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	10 Version 1607 10.0.14393.0
Microsoft	Windows	10 Version 1809 10.0.17763.0
Microsoft	Windows	10 Version 21H2 10.0.19044.0
Microsoft	Windows	10 Version 22H2 10.0.19045.0
Microsoft	Windows	11 version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 24H2 10.0.26100.0
Microsoft	Windows	11 Version 25H2 10.0.26200.0
Microsoft	Windows	11 version 26H1 10.0.28000.0
Microsoft	Windows	Server 2012 6.2.9200.0
Microsoft	Windows	Server 2012 (Server Core installation) 6.2.9200.0
Microsoft	Windows	Server 2012 R2 6.3.9600.0
Microsoft	Windows	Server 2012 R2 (Server Core installation) 6.3.9600.0
Microsoft	Windows	Server 2016 10.0.14393.0
Microsoft	Windows	Server 2016 (Server Core installation) 10.0.14393.0
Microsoft	Windows	Server 2019 10.0.17763.0
Microsoft	Windows	Server 2019 (Server Core installation) 10.0.17763.0
Microsoft	Windows	Server 2022 10.0.20348.0
Microsoft	Windows	Server 2025 10.0.26100.0
Microsoft	Windows	Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Attack-Flow Graph

Executive Summary

This vulnerability is an integer overflow or wraparound flaw in the Windows iSCSI service. It allows an unauthorized attacker to execute arbitrary code remotely over a network by exploiting this flaw.

Detection Guidance

Detecting this vulnerability requires checking for unpatched Windows systems with iSCSI enabled. Use Windows Update to verify if the latest security patches are installed. Check the iSCSI service status via 'sc query msiscsi' in Command Prompt. Monitor network traffic for unusual iSCSI connections using 'netstat -ano | findstr 3260'.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially gaining control over it. This could lead to data theft, installation of malware, or disruption of services if you are running an affected Windows version.

Compliance Impact

This vulnerability allows remote code execution via an integer overflow in Windows iSCSI, which could lead to unauthorized access and data breaches. Such breaches may violate GDPR's data protection requirements and HIPAA's security rules for protected health information.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows iSCSI component. Disable iSCSI if not in use and monitor network traffic for suspicious activity targeting iSCSI ports.

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