CVE-2026-44856: Arubanetworks ArubaOS Buffer Overflow Flaw

CVE-2026-44856 Overview

CVE-2026-44856 is a stack-based buffer overflow [CWE-121] affecting multiple management service components reachable through the command-line interface (CLI) of HPE Aruba Networking AOS-8 and AOS-10 operating systems. The flaw also affects Aruba SD-WAN deployments running these platforms. An authenticated attacker with administrative privileges can send specially crafted requests to the affected services and trigger memory corruption on the stack. Successful exploitation allows arbitrary code execution with elevated privileges on the underlying operating system, providing a path from administrative CLI access to full host compromise.

Critical Impact

Authenticated administrators can escalate to arbitrary code execution on the underlying OS of Aruba controllers, gateways, and SD-WAN appliances.

Affected Products

• HPE Aruba Networking AOS-8 Operating System
• HPE Aruba Networking AOS-10 Operating System
• HPE Aruba Networking SD-WAN

Discovery Timeline

• 2026-05-12 - CVE-2026-44856 published to NVD
• 2026-05-14 - Last updated in NVD database

Technical Details for CVE-2026-44856

Vulnerability Analysis

The vulnerability resides in several underlying management service components that process input received through the AOS-8 and AOS-10 CLI. These services copy attacker-controlled data into fixed-size stack buffers without enforcing proper length validation. When an authenticated administrator submits a crafted CLI request, the oversized input overruns the buffer and corrupts adjacent stack memory, including saved return addresses and frame pointers.

The affected services run with elevated privileges on the underlying operating system. Exploitation therefore crosses a privilege boundary: the attacker starts inside the constrained CLI interpreter and ends with native code execution on the device host OS. This is significant on Aruba controllers and SD-WAN gateways, where the host context provides direct access to traffic forwarding, cryptographic material, and management plane services.

Root Cause

The root cause is missing bounds checking when CLI handlers marshal command arguments into stack-allocated buffers in the affected management service components. The condition is a classic [CWE-121] stack-based buffer overflow.

Attack Vector

The attack is network-reachable but requires high privileges: the attacker must already hold administrative credentials for the device CLI. Once authenticated, the attacker issues specially crafted CLI requests to one of the vulnerable backend services. No user interaction is required. The EPSS score is 0.077% (22.957 percentile), and there is no public proof-of-concept or evidence of in-the-wild exploitation at this time.

Detailed exploitation primitives have not been published. Refer to the HPE Security Bulletin for technical guidance specific to each affected component.

Detection Methods for CVE-2026-44856

Indicators of Compromise

• Unexpected crashes, restarts, or coredumps from AOS-8 or AOS-10 management service processes following CLI activity.
• Administrative CLI sessions issuing abnormally long arguments or non-printable byte sequences to management commands.
• New or unexplained processes spawned by management service components on the underlying OS.

Detection Strategies

• Audit administrative authentication events on Aruba controllers, gateways, and SD-WAN appliances for logins from unexpected sources or outside change windows.
• Correlate CLI command auditing with process crash events to identify command sequences that precede service failures.
• Compare running firmware versions against the fixed releases listed in the HPE advisory and flag any device still exposed.

Monitoring Recommendations

• Forward AOS-8 and AOS-10 syslog, AAA, and crash logs to a central analytics platform for retention and correlation.
• Restrict management plane access using dedicated management VLANs and ACLs, and alert on CLI access from outside those segments.
• Monitor administrative account usage and rotate credentials on any suspected exposure.

How to Mitigate CVE-2026-44856

Immediate Actions Required

• Apply the fixed AOS-8, AOS-10, and SD-WAN releases identified in the HPE Aruba Networking security bulletin without delay.
• Restrict CLI and management plane access to a small set of trusted administrative hosts and jump servers.
• Rotate administrative credentials and review accounts with privileged CLI access on all affected devices.
• Enable command auditing and ship logs off-device to preserve forensic evidence.

Patch Information

HPE Aruba Networking has published remediation guidance, including fixed software versions, in the HPE Security Bulletin hpesbnw05048en_us. Operators should map their current AOS-8, AOS-10, and SD-WAN versions against the advisory and upgrade to a fixed release on every affected controller, gateway, and SD-WAN node.

Workarounds

• Limit administrative interface exposure to dedicated management networks and enforce ACLs that block CLI access from user, guest, and internet-facing segments.
• Enforce multi-factor authentication and role-based access control for administrative accounts to raise the bar for the required privilege level.
• Disable or constrain administrative accounts that do not require interactive CLI access until patching is complete.

# Example: restrict SSH management access to a trusted jump host on AOS
configure terminal
ip access-list standard MGMT-ACL
  permit host 10.10.10.5
  deny any
exit
ssh mgmt-auth username/password
management-acl MGMT-ACL
write memory