Intro

A critical vulnerability affecting HPE Aruba Networking AOS-CX switches allows unauthenticated attackers to bypass authentication controls through the web management interface and reset administrator credentials. While no public exploitation has been confirmed, the flaw presents a direct path to full device control if management interfaces are exposed to untrusted networks.

📌 CVE Context

– Products & versions affected
Aruba Networking AOS-CX operating system running on HPE CX-series campus and data center switches.
– Disclosure timeline
Vulnerability disclosed via HPE security advisory alongside patches for multiple authentication and code execution issues.
– Attack vector, auth level, impact
Remote network-based attack against the web management interface requiring no authentication. Successful exploitation can allow attackers to reset administrator passwords and gain privileged control of the switch.

CVSS Metric Breakdown (v4.0) - CVE-2026-23813 (Aruba AOS-CX authentication bypass)
Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality Impact (VC): High
Integrity Impact (VI): High
Availability Impact (VA): Low
Scope Changed (SC): Yes
Safety Impact (SI): None
Automation (SA): High
Exploit Maturity: Unproven (no public PoC at disclosure)
Base Score: 9.8 (Critical)

– Exploit tools, payloads observed, confirmed victims, global exposure count if known
As of advisory release, HPE reported no public exploit code or confirmed exploitation. However, similar management interface vulnerabilities in networking infrastructure are historically targeted quickly after disclosure.

🎯 EPSS Scoring

The Exploit Prediction Scoring System (EPSS) probability for this vulnerability currently sits around 0.00064 with a percentile ranking of approximately 0.19531. This indicates low predicted short-term exploitation likelihood based on available telemetry models.

🔬 Exploitation Detail

– Step-by-step breakdown
1. Attacker identifies an exposed Aruba AOS-CX management interface.
2. The attacker sends crafted requests to the switch’s web-based management service.
3. Authentication validation logic fails to properly enforce credential verification.
4. The attacker triggers password reset functionality without valid session authentication.
5. The attacker sets a new administrator password and gains privileged access.

– Where it lives (heap, parser, macro, etc.)
The vulnerability exists within the authentication control logic of the AOS-CX web management interface, specifically in how REST/HTTP requests are validated before password reset actions are executed.

POST /rest/v1/system/users/admin/reset HTTP/1.1
Host: target-switch
Content-Type: application/json
{
 "new_password":"AttackerControlledPassword!"
}

📎 Attacker Behavior Snapshot

– What the attacker sends
Crafted HTTP requests targeting password reset or administrative user management endpoints.

– What the system does
Processes the request without enforcing proper authentication checks.

– What leaks back (tokens, stack traces, paths)
The system may return confirmation responses indicating password change success, allowing attackers to confirm compromise.

🧩 Why This Matters

This vulnerability highlights how management interfaces in network infrastructure often become high-value targets when exposed to untrusted networks. Switches represent critical control points in enterprise environments, and compromise can enable traffic interception, lateral movement, and infrastructure manipulation.

Exploitation results in:

• Full administrative control of network switches
• Ability to manipulate VLAN configurations and routing policies
• Potential network traffic interception and redirection

🧩 MITRE ATT&CK Mapping

Initial Access: T1190 – Exploit Public-Facing Application
Execution: T1059.003 – Command Shell
Persistence: T1505.003 – Server Software Component

🧪 Detection Rules

YARA Rule (Memory/Doc/PCAP)

rule Aruba_AOSCX_Auth_Bypass
{
    meta:
        description = "Detect suspicious Aruba AOS-CX password reset requests"
        author = "Cyber Pulse"
    strings:
        $endpoint = "/rest/v1/system/users"
        $reset = "reset"
    condition:
        $endpoint and $reset
}

Suricata or Zeek (Network)

alert http any any -> any any (
    msg:"Possible Aruba AOS-CX Admin Password Reset Attempt";
    flow:to_server,established;
    content:"/rest/v1/system/users"; http_uri;
    content:"reset"; http_uri;
    classtype:web-application-attack;
    sid:900001;
    rev:1;
)

Sigma Rule (SIEM/EDR)

title: Aruba AOS-CX Suspicious Password Reset
logsource:
  category: network
detection:
  selection:
    http_uri|contains:
      - "/rest/v1/system/users"
      - "reset"
  condition: selection
level: high

🔎 Detection Strategies

✅ Network Detection:

• Monitor inbound traffic to switch management interfaces
• Detect unusual HTTP requests targeting REST endpoints
• Alert on management traffic originating outside approved management VLANs

✅ Endpoint Detection:

• Monitor configuration changes on network devices
• Detect unexpected administrator account resets
• Alert on management logins originating from new source IPs

⚡ Splunk Query

index=network_logs sourcetype=http
uri_path="/rest/v1/system/users*"
method=POST
| stats count by src_ip, dest_ip, uri_path

🛠️ SOC Detection Strategy

– Triage levels, log sources, alert logic
SOC teams should prioritize alerts involving password reset endpoints on network infrastructure devices. Logs from management VLANs, firewall access logs, and switch audit logs should be correlated to detect unauthorized management activity.

– How to tune and escalate
Restrict alerts to management interface IP ranges and investigate any requests originating from non-administrative hosts.

– What real-world alerts might look like
Alerts may appear as unexpected HTTP POST requests to REST endpoints on switch management interfaces.

🛠️ Tools & Techniques

Tool | Usage
Sysmon | Detect parent-child anomalies
Velociraptor | Endpoint hunting for shell commands
Zeek | HTTP signature logging and anomaly detection
Sigma/YARA | Create detection rules for management interface abuse patterns

🛡️ Mitigation & Response

– Apply HPE Aruba patches addressing the AOS-CX authentication vulnerabilities.
– Restrict management interfaces to dedicated Layer 2 segments or VLANs.
– Enforce strict Layer 3 policies allowing only trusted management hosts.
– Disable HTTP(S) access on SVIs or routed interfaces when not required.
– Implement Control Plane ACLs to restrict REST/HTTPS endpoints.
– Enable comprehensive logging and monitoring for management activity.

📋 Incident Response Snippets

– Log queries (grep, Splunk, KQL)
Search network device logs for unauthorized admin password reset events.

grep -i "password reset" switch_logs.log

– IR questions to ask
Was the management interface exposed to untrusted networks?
Were admin credentials changed unexpectedly?
Were configuration changes made following the reset?

– Cleanup and movement checks
Review switch configuration history, restore known-good credentials, rotate management passwords, and inspect for configuration manipulation.

📚 Suggested Reading & External References

– HPE Aruba Security Advisory
– CISA Known Exploited Vulnerabilities catalog
– Historic cases of network device authentication bypass vulnerabilities

🗾️ Final Thoughts

A simple authentication bypass in a network device management interface can rapidly escalate into full infrastructure control if left exposed.

Patch affected switches immediately and restrict management access to trusted networks.

Published: March 10, 2026