CVE-2026-76733 in Instant On
Summary
by MITRE • 09/29/2026
A denial-of-service vulnerability exists in the API endpoint of HPE Networking Instant On that could allow an authenticated attacker with administrative privileges to cause a denial of service. Successful exploitation could allow an attacker to interrupt the normal operation of the affected service, which resumes without manual intervention.
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Analysis
by VulDB Data Team • 09/30/2026
The identified security issue resides within the application programming interface endpoints of the HPE Networking Instant On platform, presenting a specific risk vector for systems administrators and network operators who rely on this management software for centralized control of their infrastructure. This vulnerability is classified as a denial-of-service condition that requires an authenticated attacker possessing administrative privileges to exploit. The necessity for high-level authentication indicates that the flaw does not stem from unauthenticated remote code execution or basic privilege escalation, but rather points toward a logic error or resource exhaustion mechanism accessible only by users who have already bypassed initial access controls and gained significant trust within the system hierarchy. This distinction is critical for threat modeling, as it suggests the primary attack surface involves insider threats, compromised administrative credentials, or lateral movement from another compromised host where an attacker has successfully elevated their privileges to the admin level.
From a technical perspective, the vulnerability likely stems from improper handling of specific API requests that trigger resource-intensive operations without adequate safeguards against infinite loops, memory leaks, or CPU saturation. When an authenticated administrator issues these malformed or specifically crafted commands through the exposed endpoint, the underlying service processes them in a manner that depletes critical system resources such as available memory, file descriptors, or processing cycles. This exhaustion leads to a state where the affected service becomes unresponsive to legitimate requests from other users or management interfaces. The operational impact is characterized by an interruption of normal network operations managed through the platform, potentially causing visibility loss into connected devices and preventing configuration changes during critical periods. However, the resilience mechanism built into the architecture ensures that the service automatically recovers without requiring manual intervention, meaning while availability is temporarily compromised, data integrity remains intact and no permanent system restart or administrative reboot is necessary to restore functionality.
In terms of industry standard classifications, this vulnerability aligns with CWE-400, which covers Uncontrolled Resource Consumption, specifically focusing on scenarios where a resource is not properly bounded against excessive use by an authenticated user. It also relates to CWE-787, Out-of-bounds Write, if the root cause involves memory corruption leading to service instability, though the description emphasizes availability impact over code execution. Within the MITRE ATT&CK framework, this behavior maps to T1499 Endpoint Denial of Service or potentially T1529 System Shutdown or Reboot if the exhaustion forces a crash that triggers automatic restarts. The requirement for administrative privileges places it within the context of Privileged Access Management failures, highlighting risks associated with excessive permissions and insufficient monitoring of admin-level API calls.
Mitigation strategies should focus on both immediate remediation and long-term architectural improvements. Administrators are advised to apply vendor-provided patches as soon as they become available, which typically address the specific logic flaws in the API endpoint handling. In the interim, network segmentation can be employed to restrict access to the management interface of HPE Networking Instant On devices to only those IP addresses that require administrative control, thereby reducing the attack surface for potential credential theft or insider abuse. Implementing strict rate limiting on all administrative API endpoints is also recommended to prevent any single user from overwhelming system resources through rapid successive requests. Furthermore, organizations should enforce multi-factor authentication and regular rotation of administrative credentials to minimize the risk of privilege compromise. Continuous monitoring of admin activity logs using a Security Information and Event Management solution can help detect anomalous patterns indicative of denial-of-service attempts before they cause significant operational disruption.