CVE-2026-23813: AOS-CX Switches Auth Bypass Vulnerability

CVE-2026-23813 Overview

A critical authentication bypass vulnerability has been identified in the web-based management interface of HPE AOS-CX switches. This vulnerability could potentially allow an unauthenticated remote actor to circumvent existing authentication controls. In some cases, successful exploitation could enable an attacker to reset the admin password, leading to complete compromise of the network switch.

Critical Impact

Unauthenticated remote attackers can bypass authentication controls on AOS-CX switches and potentially reset administrator credentials, enabling full device takeover.

Affected Products

• HPE AOS-CX Switches (web-based management interface)

Discovery Timeline

• 2026-03-11 - CVE CVE-2026-23813 published to NVD
• 2026-03-11 - Last updated in NVD database

Technical Details for CVE-2026-23813

Vulnerability Analysis

This vulnerability is classified under CWE-287 (Improper Authentication), indicating a fundamental flaw in how the web-based management interface validates user identity before granting access to protected functionality. The authentication bypass affects the web management portal of AOS-CX switches, which is typically accessible over the network on standard HTTP/HTTPS ports.

The vulnerability is particularly concerning because it requires no prior authentication, no user interaction, and can be exploited remotely over the network. An attacker with network access to the management interface can leverage this flaw to bypass security controls that would normally require valid credentials.

Root Cause

The root cause lies in improper authentication handling within the web-based management interface (CWE-287). The interface fails to properly validate authentication state or credentials for certain critical operations, allowing unauthenticated users to access functionality that should be restricted to authenticated administrators only. This may involve missing authentication checks on specific API endpoints or improper session validation logic.

Attack Vector

The attack vector is network-based, requiring the attacker to have network connectivity to the AOS-CX switch's web management interface. The exploitation path involves:

1. Identifying an exposed AOS-CX switch web management interface
2. Sending specially crafted requests that exploit the authentication bypass
3. Gaining access to administrative functions without valid credentials
4. Potentially resetting the admin password to establish persistent access

The attack requires no privileges, no user interaction, and has low complexity, making it highly exploitable for attackers who can reach the management interface.

Detection Methods for CVE-2026-23813

Indicators of Compromise

• Unexpected password reset events on AOS-CX switches without corresponding administrator activity
• Unusual HTTP/HTTPS traffic patterns to the switch management interface from unauthorized IP addresses
• Authentication log anomalies showing access to administrative functions without valid login events
• Configuration changes on switches that were not authorized by IT personnel

Detection Strategies

• Monitor network traffic to AOS-CX switch management interfaces for anomalous access patterns
• Implement network segmentation monitoring to detect unauthorized access attempts to management VLANs
• Review switch logs for authentication bypass indicators such as admin operations without preceding successful authentication
• Deploy intrusion detection rules to identify exploitation attempts against web management interfaces

Monitoring Recommendations

• Enable comprehensive logging on all AOS-CX switch management interfaces
• Configure SIEM alerts for password reset events on network infrastructure devices
• Establish baseline behavior for management interface access and alert on deviations
• Implement real-time monitoring of configuration changes on network switches

How to Mitigate CVE-2026-23813

Immediate Actions Required

• Restrict network access to AOS-CX switch management interfaces using ACLs or firewall rules
• Limit management interface access to dedicated management networks or jump hosts only
• Review switch configurations for unauthorized changes or new administrative accounts
• Monitor for any suspicious activity on switch management interfaces pending patch application

Patch Information

HPE has released a security advisory addressing this vulnerability. Administrators should consult the HPE Security Document for detailed patch information and affected firmware versions. Apply the latest security updates to all affected AOS-CX switches as soon as possible.

Workarounds

• Disable web-based management interface if not required and use CLI-based management via SSH instead
• Implement strict network segmentation to isolate management interfaces from untrusted networks
• Configure IP-based access restrictions on the management interface to allow only trusted management stations
• Enable multi-factor authentication mechanisms if supported by the switch firmware version

# Example network access restriction configuration
# Restrict management interface access to trusted subnet only
# Consult HPE documentation for specific AOS-CX CLI syntax

# Configure management ACL to limit access
# Verify web management is only accessible from management VLAN
# Consider disabling HTTP and requiring HTTPS only