CVE-2026-65791

Analyzed Analyzed - Analysis Complete

Heap-based Buffer Overflow in Windows iSCSI Target Service

Publication date: 2026-08-11

Last updated on: 2026-08-16

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Windows iSCSI Target Service allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-11

Last Modified

2026-08-16

Generated

2026-09-01

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-65791

EUVD

EUVD-2026-56738

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9418 (exc)
microsoft	windows_10_1607	to 10.0.14393.9418 (exc)
microsoft	windows_10_1809	to 10.0.17763.9115 (exc)
microsoft	windows_10_1809	to 10.0.17763.9115 (exc)
microsoft	windows_server_2016	to 10.0.14393.9418 (exc)
microsoft	windows_server_2019	to 10.0.17763.9115 (exc)
microsoft	windows_server_2022	to 10.0.20348.5440 (exc)
microsoft	windows_server_2025	to 10.0.26100.33222 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This is a heap-based buffer overflow vulnerability in the Windows iSCSI Target Service. It allows an unauthorized attacker to execute arbitrary code remotely over a network by exploiting a flaw in memory handling.

Detection Guidance

To detect this vulnerability, check if the Windows iSCSI Target Service is running on affected systems. Use PowerShell: Get-Service -Name 'MSiSCSI' or sc query MSiSCSI. Verify service status and version against Microsoft's security updates.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially gaining full control. This could lead to data theft, system damage, or unauthorized access to sensitive information.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations must address it to maintain data protection standards.

Mitigation Strategies

Apply the latest security update from Microsoft for the Windows iSCSI Target Service to patch the heap-based buffer overflow vulnerability.

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