CVE-2026-86378 in PowerProtect Data Domain
Summary
by MITRE • 10/28/2026
Dell PowerProtect Data Domain, Feature Release versions 7.7.1.0 through 8.8, LTS2024 release versions 7.13.1.0 through 7.13.1.80, LTS2025 release versions 8.3.1.0 through 8.3.1.40, LTS2026 release versions 8.6.1.0 through 8.6.1.20, contain a Stack-based Buffer Overflow vulnerability. A low privileged attacker with remote access could potentially exploit this vulnerability, leading to unauthorized access.
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Analysis
by VulDB Data Team • 10/28/2026
The identified security flaw resides within Dell PowerProtect Data Domain systems across multiple software release tracks including Feature Releases 7.7.1.0 through 8.8 and various Long Term Support releases spanning from LTS2024 version 7.13.1.0 up to 7.13.1.80, LTS2025 versions 8.3.1.0 through 8.3.1.40, and LTS2026 versions 8.6.1.0 through 8.6.1.20. This vulnerability is classified as a stack-based buffer overflow, which represents a critical memory corruption error where the program writes more data to a fixed-length block of memory stored on the call stack than it can hold. In the context of enterprise backup and storage appliances like PowerProtect Data Domain, such vulnerabilities are particularly severe because they often affect core management interfaces or network services that handle incoming requests from administrators or connected systems. The presence of this flaw indicates insufficient bounds checking when processing specific input data, allowing an attacker to overwrite adjacent memory locations on the stack.
From a technical perspective, stack-based buffer overflows typically occur when user-supplied input is copied into a local variable without verifying its length against the allocated buffer size. When the input exceeds the buffer capacity, it spills over into neighboring memory spaces that may contain return addresses or other control data critical to program execution flow. By carefully crafting malicious input payloads, an attacker can manipulate these overwritten values to redirect the instruction pointer to arbitrary code injected elsewhere in the process memory. This mechanism enables the execution of shellcode with the privileges of the vulnerable application service. Given that PowerProtect Data Domain handles sensitive backup data and management operations, successful exploitation could allow a low-privileged remote user to gain elevated access rights, potentially leading to full system compromise.
The operational impact of this vulnerability is significant due to its potential for unauthorized access by attackers who already possess limited network connectivity or valid but restricted credentials. A low privileged attacker with remote access can leverage this flaw to escalate privileges and bypass authentication mechanisms designed to protect critical infrastructure components. This could result in the exfiltration, modification, or destruction of backed-up data stored on the appliance. Furthermore, compromising a primary backup system undermines disaster recovery capabilities and may serve as an entry point for lateral movement within the broader enterprise network. The ability to execute arbitrary code remotely makes this vulnerability attractive to threat actors seeking persistent access or aiming to disrupt business continuity operations through ransomware deployment or data manipulation.
To mitigate these risks, organizations must immediately apply vendor-provided patches that address the underlying memory management issues in affected software versions. It is essential to verify which specific release version of PowerProtect Data Domain is currently deployed and ensure it falls outside the vulnerable range identified by Dell Security Advisory. In addition to patching, network segmentation strategies should be reviewed to restrict access to backup appliance interfaces from untrusted networks or unauthorized users. Implementing strict input validation at the application layer can also help prevent similar buffer overflow conditions in future software updates. Monitoring for anomalous behavior such as unexpected process crashes or unusual outbound connections may aid in detecting exploitation attempts before significant damage occurs. Regular security assessments and adherence to industry standards like CWE-121 for stack-based buffer overflows will support ongoing resilience against memory corruption vulnerabilities.