CVE-2026-23815: AOS-CX Switches RCE Vulnerability

CVE-2026-23815 Overview

A command injection vulnerability exists in a custom binary used within the HPE AOS-CX Switches' Command Line Interface (CLI). This security flaw allows an authenticated remote attacker with high privileges to inject and execute arbitrary commands on affected network switches. The vulnerability stems from improper neutralization of special elements used in command construction (CWE-77), enabling attackers to bypass intended command restrictions and execute unauthorized system commands.

Critical Impact

Successful exploitation allows authenticated attackers with administrative privileges to execute arbitrary commands on AOS-CX network switches, potentially compromising network infrastructure integrity, confidentiality, and availability.

Affected Products

• HPE AOS-CX Switches (specific versions detailed in HPE Security Advisory)
• AOS-CX CLI custom binary components

Discovery Timeline

• 2026-03-11 - CVE-2026-23815 published to NVD
• 2026-03-11 - Last updated in NVD database

Technical Details for CVE-2026-23815

Vulnerability Analysis

This vulnerability is classified as Command Injection (CWE-77), which occurs when an application constructs command strings using externally-influenced input without proper neutralization of special elements. In the context of AOS-CX Switches, the vulnerable custom binary within the CLI fails to adequately sanitize user-supplied input before incorporating it into system command execution.

The attack requires network access and high-level privileges, meaning an attacker must first authenticate to the switch with administrative credentials. Once authenticated, the attacker can leverage the command injection flaw to escape the intended CLI context and execute arbitrary operating system commands with the privileges of the underlying binary.

The impact of successful exploitation is significant across all three security dimensions: confidentiality, integrity, and availability are all fully compromised. An attacker could extract sensitive configuration data, modify switch settings, install persistent backdoors, or disrupt network operations.

Root Cause

The root cause is improper input validation and neutralization in the custom binary's command processing logic. The CLI fails to properly sanitize or escape special characters and command metacharacters before passing user input to system command execution functions. This allows attackers to inject additional commands or arguments that break out of the intended command context.

Attack Vector

The vulnerability is exploitable remotely over the network by authenticated users with high privileges. An attacker with administrative access to the AOS-CX switch CLI can craft malicious input containing command separators or shell metacharacters. When this input is processed by the vulnerable binary, the injected commands are executed alongside or instead of the intended CLI operations.

The attack scenario typically involves an attacker who has obtained legitimate administrative credentials (through compromise, credential theft, or insider threat) and then exploits this vulnerability to execute commands beyond the normal scope of CLI functionality.

Detection Methods for CVE-2026-23815

Indicators of Compromise

• Unusual command patterns in CLI session logs containing shell metacharacters such as ;, |, &, or backticks
• Unexpected system processes spawned from CLI binary contexts
• Anomalous network connections originating from switch management interfaces
• Modified system files or configurations outside normal administrative workflows

Detection Strategies

• Monitor CLI audit logs for commands containing suspicious characters or unusual command structures
• Implement behavioral analysis for administrative sessions to detect deviation from normal operational patterns
• Deploy network segmentation monitoring to identify unauthorized lateral movement from network infrastructure
• Configure SIEM rules to alert on rapid command execution patterns or commands outside expected baselines

Monitoring Recommendations

• Enable comprehensive CLI command logging on all AOS-CX switches
• Forward switch logs to centralized SIEM platform for correlation and analysis
• Establish baseline administrative command patterns and alert on deviations
• Monitor authentication logs for unusual access patterns to high-privilege accounts

How to Mitigate CVE-2026-23815

Immediate Actions Required

• Review the HPE Security Advisory for specific patching guidance
• Audit administrative access to AOS-CX switches and revoke unnecessary high-privilege accounts
• Implement network segmentation to restrict management interface access to trusted networks only
• Enable enhanced logging and monitoring for all CLI sessions

Patch Information

HPE has released security updates addressing this vulnerability. System administrators should consult the HPE Security Advisory for detailed patch information, affected version specifics, and upgrade procedures. Apply vendor-provided patches following your organization's change management processes.

Workarounds

• Restrict CLI access to only essential administrative personnel with verified need
• Implement jump hosts or bastion servers as the only allowed source for switch management connections
• Deploy multi-factor authentication for administrative access where supported
• Consider using read-only accounts for routine monitoring tasks to minimize high-privilege session exposure

# Network ACL example to restrict management access
# Apply to switch management interface to limit CLI access sources
access-list mgmt-restrict permit tcp 10.0.10.0/24 any eq ssh
access-list mgmt-restrict deny any any log