CVE-2026-73783 in AOS-CX
Summary
by MITRE • 09/02/2026
Stack overflow vulnerabilities exist in an API endpoint of AOS-CX. Successful exploitation could allow an authenticated malicious actor to cause a denial-of-service condition on the affected system.
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Analysis
by VulDB Data Team • 09/02/2026
The vulnerability described constitutes a classic stack-based buffer overflow located within a specific application programming interface endpoint of the Aruba AOS-CX operating environment. This type of flaw arises when the software fails to properly validate or bound-check user-supplied input before copying it into a fixed-size memory buffer allocated on the call stack. In this scenario, an authenticated attacker can craft a specially designed request that exceeds the expected length limits of the target endpoint's internal processing routine. When the application processes this oversized payload, the excess data overwrites adjacent memory locations on the stack, potentially corrupting critical control structures such as return addresses or frame pointers. This corruption disrupts the normal flow of execution within the process, leading to a crash or an undefined state that effectively halts the service provided by the API endpoint.
From a technical perspective, this vulnerability aligns with Common Weakness Enumeration identifier CWE-120, which classifies buffer copies without checks for overflow along a stack. The presence of authentication requirements indicates that the attack vector is not remote unauthenticated but rather requires valid credentials or session tokens to interact with the vulnerable endpoint. This constraint limits the scope of potential attackers to those who have already gained some level of access to the management interface, yet it does not mitigate the severity of the impact for authorized users who might be compromised through credential theft or insider threats. The lack of proper input validation suggests a deficiency in secure coding practices during the development phase, where boundary checks were either omitted or incorrectly implemented for specific data types received via HTTP requests.
The operational impact of successfully exploiting this stack overflow is primarily focused on availability rather than confidentiality or integrity. A successful exploitation results in a denial-of-service condition, meaning the affected system becomes unresponsive to legitimate traffic. For network infrastructure managed by AOS-CX, such as switches and routers, an API endpoint crash can disrupt automated management workflows, monitoring systems, and orchestration tools that rely on continuous communication with the device's control plane. This disruption can lead to significant downtime in production environments, requiring manual intervention or a system reboot to restore service. While the immediate effect is a denial of service, repeated exploitation attempts could potentially be leveraged as part of a broader attack chain if other memory corruption vulnerabilities are present that allow for code execution, although the current description specifically highlights the availability impact.
In terms of threat modeling and industry frameworks, this vulnerability can be mapped to MITRE ATT&CK techniques related to resource exhaustion or service disruption. Specifically, it relates to tactics involving Impact, where adversaries aim to degrade or deny access to resources. The requirement for authentication places this activity within the context of lateral movement or privilege abuse if the attacker has compromised a lower-privileged account that still retains access to the vulnerable API endpoint. Security teams should treat this as a high-priority issue due to its direct impact on system stability and availability, even in the absence of remote code execution capabilities.
To mitigate this vulnerability, immediate action must be taken by applying vendor-provided patches or firmware updates that address the input validation logic within the affected API endpoint. Administrators should ensure that all management interfaces are updated to the latest stable release containing these fixes. In addition to patching, defense-in-depth strategies should be employed. This includes restricting access to the management interface through strict network segmentation and firewall rules, ensuring that only authorized IP addresses can reach the vulnerable endpoints. Implementing Web Application Firewalls with specific rule sets designed to detect anomalous request sizes or malformed payloads can also provide a layer of protection against exploitation attempts. Furthermore, enforcing strong authentication mechanisms such as multi-factor authentication reduces the risk of credential compromise, thereby limiting the pool of potential attackers who could attempt to exploit this stack overflow condition. Regular security audits and code reviews focusing on buffer handling practices are essential for preventing similar vulnerabilities in future software releases.