CVE-2026-76746 in AOS-Switch
Summary
by MITRE • 10/06/2026
An unauthenticated buffer overflow vulnerability exists in AOS-S. Successful exploitation could allow an unauthenticated adjacent attacker to expose sensitive memory contents and cause a denial of service on the affected device.
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Analysis
by VulDB Data Team • 10/06/2026
The identified vulnerability represents a critical security flaw within the Aruba OS-Switch (AOS-S) software stack, specifically manifesting as an unauthenticated buffer overflow condition. This type of defect typically arises when a program writes more data to a fixed-length block of memory than it can hold, causing adjacent memory locations to be overwritten with unintended values. In this specific instance, the lack of authentication requirements for exploitation significantly elevates the severity and risk profile of the issue. An attacker does not need valid credentials or prior access to the network management interface to trigger the vulnerability, meaning that any entity capable of reaching the affected device over the network can potentially initiate the exploit sequence. This characteristic transforms what might otherwise be a high-severity internal threat into a critical remote exploitation vector accessible from adjacent network segments or even directly if the service is exposed externally without proper perimeter controls.
From a technical perspective, buffer overflow vulnerabilities in networking equipment often stem from improper bounds checking during the processing of incoming packets or configuration data. When an unauthenticated attacker sends specially crafted input to the vulnerable component, the application fails to validate the length of the data against the allocated buffer size. This oversight allows maliciously constructed payloads to spill over into adjacent memory spaces. The immediate consequence of this memory corruption is unpredictable behavior within the operating system processes responsible for handling network traffic or device management functions. Depending on the specific offset and content of the overflow, an attacker can manipulate return addresses or function pointers, potentially achieving arbitrary code execution, although in many cases involving networking daemons, the primary observable effects are stability-related rather than full remote control.
The operational impact of this vulnerability is twofold, encompassing both confidentiality breaches and service availability disruptions. First, the overflow condition may allow an adjacent attacker to read sensitive memory contents from the device. This could expose cryptographic keys, session tokens, internal configuration details, or other proprietary information stored in RAM during normal operation. Such data leakage can facilitate further attacks by providing attackers with insights into network topology, security policies, and authentication mechanisms. Second, and more immediately disruptive, is the potential for a denial of service condition. The memory corruption often leads to process crashes, kernel panics, or hardware resets within the switch operating system. This results in intermittent connectivity loss, complete device unavailability, or frequent reboots, which severely impacts network reliability and business continuity for organizations relying on these switches for critical infrastructure support.
In terms of industry standard classifications, this vulnerability aligns with CWE-120, Buffer Copy without Checking Size of Input Classic, as the root cause is the failure to verify input boundaries before copying data into a buffer. The ability to expose sensitive memory contents corresponds closely to CWE-125, Out-of-bounds Read, indicating that the overflow allows reading beyond the intended memory allocation. Furthermore, from an offensive security framework perspective, this scenario maps to MITRE ATT&CK technique T1078, Valid Accounts, although in this case it is exploited without valid accounts due to the unauthenticated nature of the flaw. The exploitation path likely involves network-based attacks such as packet injection or malformed request submission, which falls under initial access vectors like T1190, Exploit Public-Facing Application, if the service is internet-facing, or lateral movement techniques if used within an internal segment after gaining a foothold through other means.
Mitigation strategies must focus on both immediate remediation and long-term architectural hardening. The primary defense is to apply the vendor-provided software patch that addresses the buffer overflow logic by implementing strict input validation and bounds checking mechanisms. Organizations should prioritize updating affected AOS-S devices as soon as a stable patched version becomes available from Aruba support channels. In scenarios where immediate patching is not feasible due to maintenance windows or operational constraints, network segmentation strategies can be employed to restrict access to the vulnerable management interfaces. By placing these devices behind firewalls that enforce strict Access Control Lists (ACLs), only trusted IP addresses and administrative subnets should be permitted to communicate with the switch’s management plane. Additionally, enabling features such as TCP Wrappers or rate limiting on network ports can help mitigate the risk of exploitation attempts by filtering out malformed traffic patterns associated with buffer overflow attacks before they reach the vulnerable application layer.