CVE-2026-73764 in AOS-CX
Summary
by MITRE • 09/01/2026
Vulnerabilities have been identified in the operating system of AOS-CX switches that could potentially allow an unauthenticated remote actor to circumvent existing authentication controls. In some cases this could enable unauthorized modification of affected resources and limited disruption of affected services.
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Analysis
by VulDB Data Team • 09/01/2026
The identified vulnerabilities within the Aruba OS-CX (AOS-CX) operating system represent a critical security flaw that undermines the fundamental integrity of network device access control mechanisms. These flaws specifically affect the authentication subsystem, allowing an unauthenticated remote actor to bypass established login procedures and gain unauthorized entry into the management plane of affected switches. This capability is particularly severe because it removes the primary barrier between external networks and sensitive infrastructure components, effectively rendering traditional perimeter defenses insufficient against attackers who can reach the device over the network. The existence of such a flaw indicates a significant deviation from secure coding practices regarding input validation and state management during the authentication handshake process.
From a technical perspective, these vulnerabilities likely stem from improper handling of authentication requests or flawed logic in the session establishment phase. An attacker could exploit this by crafting specific malicious packets that trick the switch into accepting them as valid credentials or bypassing credential checks entirely. This circumvention allows the actor to execute commands with elevated privileges without providing legitimate user names or passwords. The ability to modify affected resources implies that once inside, the adversary can alter configuration files, change routing tables, or manipulate VLAN assignments, thereby compromising the confidentiality and integrity of network operations. Furthermore, the potential for limited disruption suggests that even if full control is not achieved, the attacker might be able to trigger service degradation through resource exhaustion or invalid state transitions within the management interface.
The operational impact of these vulnerabilities extends beyond simple unauthorized access. By enabling an unauthenticated actor to modify resources, the integrity of network policies and configurations is compromised. This can lead to misrouting of traffic, isolation of critical segments, or exposure of internal services that were previously protected by firewall rules applied at the switch level. The limited disruption of affected services indicates a risk of denial-of-service conditions, where the stability of the switching fabric could be impacted through malformed requests or excessive authentication attempts exploiting these flaws. In enterprise environments, this translates to potential data exfiltration, lateral movement opportunities for attackers who have already breached other parts of the network, and significant downtime requiring manual intervention to restore secure configurations from backups.
In alignment with industry standards, this vulnerability class corresponds closely to CWE-287: Improper Authentication, where an actor is able to impersonate another user or bypass authentication mechanisms entirely. Additionally, the ability to modify resources aligns with CWE-693: Protection Mechanism Failure, indicating that the security controls designed to prevent unauthorized actions are not functioning as intended. From a tactical standpoint, this behavior maps to MITRE ATT&CK technique T1078: Valid Accounts, although in this specific case, it involves gaining access without valid credentials initially, which may also relate to T1190: Exploit Public-Facing Application if the vulnerability is triggered via exposed services. The subsequent modification of resources falls under T1562: Impair Defenses or T1074: Data Staged depending on whether the changes are immediate or preparatory for further attacks.
To mitigate these risks, organizations must prioritize applying vendor-provided patches to update AOS-CX firmware immediately upon release. Until patching is feasible, network segmentation strategies should be employed to restrict access to management interfaces from untrusted networks using strict Access Control Lists (ACLs). Implementing multi-factor authentication where supported can add a layer of defense-in-depth, although it does not directly fix the underlying vulnerability if the bypass occurs before credential validation. Continuous monitoring for anomalous login attempts or configuration changes is essential to detect exploitation in real-time. Regular audits of switch configurations and adherence to least-privilege principles ensure that even if an attacker gains access, their ability to cause widespread damage remains constrained by existing policy boundaries.