CVE-2026-73761 in AOS-CX
Summary
by MITRE • 09/02/2026
An out-of-bounds read vulnerability exists in the underlying operating system of AOS-CX that could lead to unauthenticated information disclosure by sending a specially crafted packet. Successful exploitation of this vulnerability results in the ability to disclose sensitive information from the underlying operating system.
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Analysis
by VulDB Data Team • 09/02/2026
The identified vulnerability represents an out-of-bounds read condition within the network stack processing logic of the ArubaOS-CX operating environment. This flaw is triggered when the device processes a specifically crafted packet that violates expected boundary constraints during data parsing or buffer handling operations. In standard software architecture, memory access controls are designed to ensure that programs only interact with memory locations they have been explicitly allocated and authorized to use. However, in this specific instance, insufficient validation of input parameters allows an attacker to force the system to read from a memory address outside the intended buffer boundaries. This type of error is classically categorized under CWE-125, which defines out-of-bounds read vulnerabilities where software reads data past the end or before the beginning of the intended buffer. The root cause typically stems from improper index calculation or lack of bounds checking during the processing of network protocol headers or payload data structures.
The operational impact of this vulnerability is significant due to its potential for unauthenticated information disclosure. Because the exploit does not require prior authentication, any external actor with network connectivity to the affected device can attempt to trigger the flaw remotely. When successfully exploited, the out-of-bounds read allows the attacker to retrieve arbitrary data from the system's memory space. This disclosed information may include sensitive operational details such as internal IP addresses, routing table configurations, session tokens, cryptographic keys, or other proprietary data stored in adjacent memory regions. The leakage of such information can serve as a critical stepping stone for further attacks, enabling adversaries to map the network topology, identify high-value targets, or potentially craft more sophisticated exploits that rely on knowing specific system states or secrets. This aligns with ATT&CK technique T1005, which covers Data from Local System, specifically indicating how an adversary might gather information directly from a compromised host without needing elevated privileges initially.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements. The primary defense is the application of vendor-provided software patches or firmware updates that correct the memory access logic within the ArubaOS-CX codebase. Administrators should prioritize updating to versions where the bounds checking mechanisms have been rigorously tested and validated. In scenarios where patching cannot be immediately implemented, network segmentation plays a crucial role in limiting exposure. By restricting direct IP connectivity to the management interfaces of affected devices using firewalls or access control lists, organizations can reduce the attack surface available to potential attackers. Additionally, implementing strict ingress filtering on border routers ensures that malformed packets with suspicious header structures are dropped before they reach the vulnerable network device. Continuous monitoring for anomalous traffic patterns indicative of fuzzing attempts or exploitation probes should also be integrated into security operations center workflows to detect and respond to active threats targeting this specific flaw.