CVE-2026-53477 in Command Update
Summary
by MITRE • 08/19/2026
Dell Command Update (DCU), versions prior to 5.7.1, contain a Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability. A low privileged attacker with local access could potentially exploit this vulnerability, leading to Elevation of Privileges.
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Analysis
by VulDB Data Team • 08/19/2026
The Dell Command Update utility serves as a critical component in enterprise IT infrastructure, responsible for managing and deploying firmware and driver updates across Dell hardware platforms. Versions prior to 5.7.1 contain a significant security flaw classified as a Time-of-check Time-of-use race condition vulnerability. This type of vulnerability arises when the system checks the state or permissions of a resource at one point in time but uses that same resource after its state has potentially changed due to concurrent operations by another process. In this specific context, the application fails to maintain atomicity between verifying file integrity or ownership and subsequently modifying or executing those files. This creates a narrow window during which an attacker can manipulate the underlying filesystem objects to bypass security controls designed to prevent unauthorized modifications.
From a technical perspective, the flaw allows for Elevation of Privileges when exploited by a low-privileged user with local access to the system. The vulnerability typically manifests in how DCU handles temporary files or configuration directories during update operations. If an attacker can predict or influence the path and timing of these file operations, they may be able to replace legitimate files with malicious ones before the utility processes them. Because Dell Command Update often runs with elevated privileges to apply firmware updates that require administrative rights, successfully exploiting this race condition allows a standard user to execute arbitrary code within the context of the privileged process. This effectively bypasses local access controls and grants the attacker full control over the affected system.
The operational impact of this vulnerability is severe, as it compromises the integrity and confidentiality of the endpoint. An attacker who exploits this flaw can install backdoors, exfiltrate sensitive data, or pivot to other systems within the network using the compromised host's elevated credentials. This undermines the trust in automated update mechanisms, which are essential for maintaining patch levels against known vulnerabilities. Furthermore, because firmware updates often touch low-level system components, a successful exploitation could potentially lead to persistent malware that survives operating system reinstalls if malicious code is injected into BIOS or UEFI modules managed by DCU.
This vulnerability aligns with CWE-367, which defines Time-of-check Time-of-use (TOCTOU) race conditions as errors in concurrent programming where the state of a resource changes between its verification and use. It also maps to MITRE ATT&CK technique T1059, specifically Command and Scripting Interpreter sub-techniques such as PowerShell or Windows CMD, which an attacker might leverage after gaining initial execution privileges through this elevation flaw. The attack vector is classified under Local Access with Low Privileges, indicating that physical access or local account compromise is required to initiate the exploit.
To mitigate this risk, organizations should immediately update Dell Command Update to version 5.7.1 or later on all affected systems. This updated release includes patches that enforce stricter file handling practices and ensure atomic operations during update processes, thereby closing the race condition window. In environments where immediate patching is not feasible, administrators can implement additional controls such as restricting local user privileges for running DCU, monitoring filesystem changes in directories associated with Dell updates using host-based intrusion detection systems, or disabling automatic execution of unsigned scripts if applicable. Regular auditing of system logs for unusual privilege escalation events and ensuring that the principle of least privilege is strictly enforced across all administrative accounts will further reduce the attack surface available to potential adversaries exploiting this vulnerability.