CVE-2026-73768: AOS-CX CLI RCE Vulnerability

CVE-2026-73768 Overview

CVE-2026-73768 is an input validation flaw [CWE-20] in the command line interface (CLI) of HPE Aruba Networking AOS-CX. The vulnerability stems from improper processing of malformed input supplied to the CLI. An authenticated local attacker with low privileges can leverage the flaw to execute arbitrary commands with root privileges on affected switches.

Critical Impact
Successful exploitation grants root-level command execution on AOS-CX network switches, allowing full control of routing, switching, and management planes.

Affected Products

HPE Aruba Networking AOS-CX (see HPE Security Bulletin for affected versions)
AOS-CX switch platforms exposing the affected CLI
Management interfaces reachable by authenticated operator accounts

Discovery Timeline

2026-09-01 - CVE-2026-73768 published to the National Vulnerability Database (NVD)
2026-09-03 - Last updated in NVD database

Technical Details for CVE-2026-73768

Vulnerability Analysis

The vulnerability resides in the AOS-CX command line interface parser. The CLI fails to properly validate or sanitize malformed input before passing it to underlying system routines. Because the CLI executes privileged operations on behalf of authenticated users, unchecked input can break out of the intended command context.

Attackers with a valid local, low-privileged CLI session can craft input that triggers execution of arbitrary shell commands. Those commands run with root privileges, giving the attacker full control of the switch operating system. Compromise of a switch enables traffic interception, configuration tampering, persistent backdoors, and lateral movement into the management network.

Exploitation requires user interaction and local access, but the resulting confidentiality, integrity, and availability impacts are all high. In segmented networks, an attacker who has already obtained operator-level credentials through phishing or credential reuse can escalate to full device compromise.

Root Cause

The root cause is improper input validation [CWE-20] in the AOS-CX CLI. Command arguments containing shell metacharacters or unexpected byte sequences are not filtered before invocation of downstream privileged handlers, resulting in command injection into the root context.

Attack Vector

The attack vector is local and authenticated. An attacker with valid credentials for the CLI, typically via SSH or a serial console, submits a crafted command containing malformed input. The CLI processes the payload and dispatches injected commands to the underlying operating system as root. Refer to the HPE Security Bulletin for exploit conditions and version-specific detail.

// No verified public proof-of-concept is available.
// See the HPE Security Bulletin for technical detail on the affected CLI command and input handling.

Detection Methods for CVE-2026-73768

Indicators of Compromise

Unexpected root-owned processes spawned from CLI sessions on AOS-CX switches
CLI audit log entries containing shell metacharacters such as ;, |, `, or $( in command arguments
New or modified files under system directories following an interactive CLI session
Configuration changes or user account additions that do not correlate with authorized change tickets

Detection Strategies

Forward AOS-CX AAA and command accounting logs to a centralized SIEM for parsing of unusual argument patterns
Alert on CLI commands that include shell control characters or excessively long argument strings
Correlate operator logins with subsequent privileged process creation to surface privilege escalation attempts

Monitoring Recommendations

Enable TACACS+ or RADIUS command accounting on all AOS-CX devices and retain logs for forensic review
Monitor SSH and console session activity for low-privilege accounts issuing unusual command sequences
Baseline expected CLI usage per role and alert on deviations, particularly for read-only or operator accounts

How to Mitigate CVE-2026-73768

Immediate Actions Required

Apply the fixed AOS-CX firmware version documented in the HPE Security Bulletin as soon as feasible
Restrict CLI access to a dedicated, isolated management network and enforce jump-host access
Audit AOS-CX local and remote user accounts, removing unused or shared credentials
Rotate credentials for any account that has interactive CLI access to affected switches

Patch Information

HPE has published fixed AOS-CX releases in bulletin hpesbnw05134en_us. Consult the HPE Security Bulletin for the exact patched versions that correspond to each affected AOS-CX train and switch platform, and plan upgrades through standard change windows.

Workarounds

Limit CLI login to a minimal set of trusted administrators until patches are deployed
Require multi-factor authentication in front of the management plane via a bastion or privileged access management system
Enforce role-based access control so operator accounts cannot reach the affected CLI commands where possible
Increase logging verbosity for command accounting to shorten detection time if exploitation is attempted

bash

# Example: restrict SSH access to the management VLAN and jump host only
ssh server vrf mgmt
access-list ip MGMT_SSH_ONLY
  10 permit tcp 10.10.0.0/24 any eq ssh
  20 deny tcp any any eq ssh
  30 permit any any any
interface mgmt
  ip access-group MGMT_SSH_ONLY in