CVE-2026-76734 in Instant On
Summary
by MITRE • 09/29/2026
A memory corruption vulnerability in the affected interface of HPE Networking Instant On could allow an unauthenticated remote attacker to conduct a denial of service attack. Successful exploitation could allow an attacker to interrupt the normal operation of the affected service and to access some limited information within the affected component.
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Analysis
by VulDB Data Team • 09/29/2026
The identified security flaw resides within the network interface handling mechanisms of HPE Networking Instant On, presenting a critical risk vector for unauthenticated remote attackers. This vulnerability is characterized as a memory corruption issue, which typically arises from improper management of allocated memory blocks during data processing operations. In this specific context, the affected component fails to adequately validate or bound input parameters before writing them into system memory structures. Such failures often manifest as buffer overflows, use-after-free errors, or heap corruption scenarios where external inputs exceed expected limits or interact with freed memory regions. The absence of rigorous boundary checks allows maliciously crafted packets or requests to overwrite adjacent memory locations, destabilizing the internal state of the application running on the device.
From an operational perspective, the primary impact of this vulnerability is a denial of service condition. By triggering the memory corruption flaw, an attacker can cause the affected service process to crash or become unresponsive, effectively interrupting normal network operations managed by the Instant On platform. This disruption can lead to significant downtime for connected devices and users relying on the network infrastructure for connectivity. While the primary consequence is availability loss, the vulnerability description also indicates that successful exploitation may permit access to limited information within the affected component. This suggests a potential secondary impact involving data leakage or exposure of internal system states, although the scope appears restricted compared to full remote code execution scenarios. The ability to extract even partial information can aid attackers in further reconnaissance or refining their exploit strategies against other components.
In terms of industry classification standards, this vulnerability aligns with CWE-120 Buffer Copy without Checking Size of Input and potentially CWE-787 Out-of-bounds Write depending on the specific memory corruption mechanism observed. These categories highlight the fundamental failure to enforce proper input validation and bounds checking during data handling processes. Furthermore, from a tactical standpoint within the MITRE ATT&CK framework, this exploit scenario corresponds to techniques associated with Denial of Service attacks against network services or applications. Attackers would likely utilize remote exploitation capabilities to send malformed requests that trigger the memory fault, thereby achieving service disruption without requiring prior authentication credentials. This lack of an authentication requirement significantly lowers the barrier for entry, allowing any actor on the network path to attempt exploitation.
To mitigate this risk, immediate action is required from system administrators and security teams responsible for maintaining HPE Networking Instant On infrastructure. The most effective remediation strategy involves applying vendor-provided patches or firmware updates that address the underlying memory management flaws in the affected interface code. Organizations should prioritize updating devices exposed to untrusted networks or those handling sensitive traffic until the patch is deployed. Additionally, implementing network-level controls such as access control lists can help restrict direct interaction with vulnerable interfaces from unauthorized sources. Monitoring logs for unusual patterns of requests that might trigger crashes can also serve as an early warning mechanism while patches are being prepared. Regular vulnerability assessments and penetration testing should be conducted to identify similar memory safety issues across the broader network architecture, ensuring a robust defense-in-depth posture against both denial-of-service attacks and potential information disclosure vectors.