CVE-2026-67271 in PowerStore
Summary
by MITRE • 08/18/2026
Dell PowerStore SDNAS, contains an Out-of-bounds Write vulnerability in the SMB/CIFS. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to Denial of service and Remote execution. This is a Critical vulnerability as a remote user could send a specially crafted SMB packet and cause a crash, that is persistent in case automatic restarts are enabled. Additionally, a more sophisticated attacker could use the same vulnerability for Remote Code execution.
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Analysis
by VulDB Data Team • 08/18/2026
The Dell PowerStore Storage Domain Name System service contains an Out-of-bounds Write vulnerability within its implementation of the Server Message Block and Common Internet File System protocols. This security flaw arises from insufficient validation of input data received during SMB/CIFS communication sessions, allowing a remote actor to write data beyond the boundaries of allocated memory buffers. The presence of this vulnerability in network-facing services significantly expands the attack surface, as it permits exploitation by unauthenticated attackers who possess only basic remote connectivity to the affected system.
The operational impact of this flaw is severe and multifaceted, primarily manifesting as a Denial of Service condition when an attacker sends specially crafted SMB packets designed to trigger memory corruption. This leads to service crashes that can be persistent if automatic restart mechanisms are enabled on the storage appliance, resulting in prolonged downtime for critical data access operations. Beyond availability issues, the vulnerability poses a significant risk to system integrity and confidentiality because it allows for potential Remote Code Execution. A sophisticated attacker could leverage this out-of-bounds write condition to overwrite function pointers or return addresses, thereby gaining arbitrary code execution capabilities on the underlying operating system with the privileges of the affected service process.
From a classification perspective, this vulnerability aligns with CWE-787, which denotes an Out-of-bounds Write error where data is written outside the bounds of a buffer. The exploitation technique corresponds to ATT&CK tactic T1203, specifically referencing Exploitation for Client Execution or Service Execution, as it involves leveraging client-side protocol handlers to achieve code execution on server infrastructure. This classification highlights the critical nature of input validation in network protocols and underscores the risk associated with complex legacy protocols like SMB/CIFS that are frequently targeted by automated exploitation tools.
Mitigation strategies should prioritize immediate patching through official Dell security updates, which address the buffer handling logic within the SDNAS component. In environments where patching is not immediately feasible, administrators should restrict access to the affected ports using network segmentation or firewall rules to limit exposure to trusted IP ranges only. Additionally, enabling strict logging and monitoring for anomalous SMB traffic patterns can aid in early detection of exploitation attempts. Regular vulnerability assessments and penetration testing are recommended to identify similar implementation flaws across other network services hosted on the platform.