CVE-2026-44880: AOS-CX CLI Buffer Overflow RCE Vulnerability

CVE-2026-44880 Overview

CVE-2026-44880 is a buffer overflow vulnerability [CWE-120] in the command line interface (CLI) of HPE Aruba Networking AOS-CX. The flaw allows a remote, low-privileged authenticated user to trigger memory corruption through crafted CLI input. Successful exploitation results in arbitrary code execution as a privileged user on the underlying operating system of the switch. This effectively grants an attacker full control over affected network infrastructure devices. The vulnerability affects the network operating system that powers HPE Aruba CX series switches deployed in enterprise campus, data center, and branch environments.

Critical Impact
A low-privileged remote attacker can escalate to arbitrary code execution as a privileged user on AOS-CX switches, compromising core network infrastructure.

Affected Products

HPE Aruba Networking AOS-CX (see HPE Security Bulletin for specific versions)
HPE Aruba CX series switches running vulnerable AOS-CX firmware
Network devices exposing the AOS-CX CLI to authenticated users

Discovery Timeline

2026-07-21 - CVE-2026-44880 published to NVD
2026-07-22 - Last updated in NVD database

Technical Details for CVE-2026-44880

Vulnerability Analysis

The vulnerability is a classic buffer overflow [CWE-120] within the AOS-CX CLI parser. The CLI accepts input from authenticated users and copies it into a fixed-size buffer without correctly validating input length. When an attacker supplies input exceeding the expected bounds, adjacent memory is overwritten. This corruption can be leveraged to redirect execution flow and run attacker-controlled code in the context of a privileged system process.

Because the CLI runs with elevated privileges on the switch, exploitation crosses a privilege boundary. A user with only low-level operator access can escalate to full administrative or root-equivalent control of the underlying network operating system. Compromise of a switch enables traffic interception, lateral movement, persistent implants, and disruption of network availability.

Root Cause

The root cause is insufficient bounds checking on user-supplied input inside a CLI command handler. The handler does not enforce the maximum length of an argument before writing to a stack or heap buffer. This is a canonical instance of copying attacker-controlled data into a fixed-size destination without validating length.

Attack Vector

Exploitation requires network access to the management interface of the switch and valid low-privilege credentials. The attacker connects over SSH or another CLI channel, authenticates, and issues a specially crafted command containing an oversized argument. The oversized argument overflows the target buffer, overwrites control data, and diverts execution to attacker-controlled logic. No user interaction is required beyond the attacker's own session.

Exploitation requires only network access to the management plane and valid low-privileged credentials, with no user interaction. See the HPE Security Bulletin for the technical description provided by the vendor.

Detection Methods for CVE-2026-44880

Indicators of Compromise

Unexpected CLI process crashes, restarts, or core dumps on AOS-CX devices, often visible in show events or system logs.
SSH sessions from low-privileged accounts issuing unusually long command arguments or malformed token sequences.
New privileged users, modified admin accounts, or unexpected configuration changes shortly after low-privilege CLI logins.
Outbound connections initiated by the switch to unknown hosts, indicating a possible post-exploitation implant.

Detection Strategies

Forward AOS-CX syslog and authentication events to a centralized log platform and alert on repeated CLI crashes tied to a single session.
Baseline normal CLI command length and structure per role, then flag sessions issuing arguments that exceed the baseline by a large margin.
Correlate low-privilege authentication events with subsequent configuration changes requiring higher privilege.

Monitoring Recommendations

Enable verbose CLI auditing on AOS-CX and centralize logs for retention and correlation.
Monitor management-plane access lists and alert on SSH sessions originating from unexpected source networks.
Track firmware version inventory across switches and flag devices still running vulnerable AOS-CX releases.

How to Mitigate CVE-2026-44880

Immediate Actions Required

Apply the fixed AOS-CX firmware version listed in the HPE Security Bulletin as soon as change windows allow.
Restrict management-plane access so that only trusted administrator subnets can reach the CLI over SSH.
Rotate credentials for all low-privileged operator accounts and audit for unused or stale accounts.
Review recent configuration changes and privileged actions on affected switches for signs of exploitation.

Patch Information

HPE has published upgrade guidance and fixed firmware versions in the HPE Security Bulletin. Administrators should identify the exact AOS-CX branch running on each switch and upgrade to the vendor-specified remediated release. No configuration workaround fully substitutes for the firmware update.

Workarounds

Limit CLI access to a dedicated management VLAN and enforce access control lists on the management interface.
Require multi-factor authentication and jump-host access for all administrative sessions to network devices.
Reduce the number of low-privileged accounts on AOS-CX devices and apply least-privilege role assignments.

bash

# Example: restrict SSH management access on AOS-CX to a trusted subnet
ssh server vrf mgmt
access-list ip MGMT_ACCESS
    10 permit tcp 10.10.0.0/24 any eq ssh
    20 deny tcp any any eq ssh
apply access-list ip MGMT_ACCESS control-plane vrf mgmt