CVE-2026-65679
Summary
by MITRE • 08/11/2026
Heap-based buffer overflow in Windows iSCSI Target Service allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability represents a critical heap-based buffer overflow within the Windows iSCSI Target Service that enables remote code execution by unauthorized attackers. The flaw exists in how the service processes incoming network requests through the iSCSI protocol implementation, specifically when handling malformed data structures during target configuration or session establishment phases. The vulnerability stems from inadequate input validation and memory management practices within the service's parsing routines for iSCSI command packets, particularly affecting the target service component that handles storage virtualization over network protocols.
The technical exploitation of this vulnerability occurs through carefully crafted iSCSI commands that trigger the buffer overflow condition in heap memory allocated for processing target requests. When an attacker sends malformed SCSI commands or target discovery requests to a vulnerable Windows system running iSCSI Target Service, the service fails to properly bounds-check incoming data before copying it into fixed-size heap buffers. This creates a classic heap corruption scenario where attacker-controlled data overflows into adjacent memory regions, potentially allowing arbitrary code execution with the privileges of the iSCSI Target Service process. The vulnerability is particularly dangerous because it operates at the network level without requiring local system access, making it suitable for remote exploitation.
The operational impact of this vulnerability extends beyond simple privilege escalation as it affects enterprise storage infrastructure and networked systems that rely on iSCSI target implementations. Organizations with Windows servers configured as iSCSI targets face significant risk since attackers can exploit this vulnerability to gain unauthorized access to storage resources, potentially leading to data exfiltration, system compromise, or disruption of critical business operations. The attack surface includes any Windows system running the iSCSI Target Service component, particularly affecting enterprise environments where centralized storage management and network-based storage virtualization are common practices. Security teams must consider this vulnerability as a high-priority threat due to its remote exploitability and potential for lateral movement within networks.
Mitigation strategies should focus on immediate patch deployment from Microsoft security updates addressing the heap overflow condition in iSCSI Target Service implementations. Organizations should implement network segmentation and access controls limiting iSCSI traffic to trusted environments while monitoring for suspicious iSCSI activity patterns that may indicate exploitation attempts. The vulnerability aligns with CWE-121 Heap-based Buffer Overflow and follows attack patterns described in MITRE ATT&CK framework under T1059 Command and Scripting Interpreter and T1071 Application Layer Protocol categories. Additional defensive measures include disabling iSCSI Target Service on systems where it is not required, implementing network intrusion detection systems to monitor for malformed iSCSI traffic, and establishing regular security assessments of storage infrastructure components that may be exposed to untrusted networks.