CVE-2026-76724: HPE Networking Instant ON AP RCE Vulnerability

CVE-2026-76724 Overview

CVE-2026-76724 is a command injection vulnerability in the command-line interface (CLI) of HPE Networking Instant ON access points (APs). An unauthenticated attacker on an adjacent network can send specially crafted packets to inject commands into the CLI. Successful exploitation grants arbitrary command execution as a privileged user on the underlying operating system.

The vulnerability carries a CVSS 3.1 base score of 9.6 with a scope change, indicating impact beyond the vulnerable component. HPE has published a security bulletin documenting the affected firmware and remediation guidance.

Critical Impact

An adjacent, unauthenticated attacker can achieve privileged command execution on affected HPE Networking Instant ON access points, compromising wireless infrastructure and enabling lateral movement into connected networks.

Affected Products

• HPE Networking Instant ON Access Points (specific models and firmware versions listed in the HPE security bulletin)
• CLI management interface exposed on adjacent network segments
• Deployments where affected firmware has not been updated per vendor guidance

Discovery Timeline

• 2026-09-29 - CVE-2026-76724 published to the National Vulnerability Database (NVD)
• 2026-09-29 - Last updated in NVD database

Technical Details for CVE-2026-76724

Vulnerability Analysis

The flaw resides in the CLI component of HPE Networking Instant ON access points. The CLI processes network-delivered input without adequately sanitizing shell metacharacters, allowing operating system commands to be appended to legitimate CLI operations. Because the CLI process runs with privileged rights on the underlying operating system, injected commands inherit those privileges.

The attack requires adjacency to the target, meaning the attacker must be on the same logical or physical network segment as the access point. No authentication or user interaction is required. The scope change reflects that compromise of the AP can affect resources beyond the AP itself, including clients and management networks it bridges.

Root Cause

The root cause is improper neutralization of special elements used in an operating system command ([CWE-78]) within the CLI packet-handling logic. Attacker-controlled fields inside crafted management packets are passed to a shell or command executor without sufficient validation or safe API usage.

Attack Vector

An attacker positioned on an adjacent network sends crafted packets to the AP's CLI service. The packets embed command separators or shell operators inside fields that the CLI later evaluates. When the CLI processes the input, the injected payload executes as a privileged operating system user. From this position, the attacker can modify AP configuration, capture wireless traffic, pivot into internal networks, or persist across reboots by tampering with firmware components.

No verified exploit code is publicly available. Refer to the HPE Security Bulletin for authoritative technical details.

Detection Methods for CVE-2026-76724

Indicators of Compromise

• Unexpected CLI sessions or management traffic originating from non-administrative hosts on the AP's management VLAN
• Anomalous outbound connections from the access point to unknown IP addresses or command-and-control infrastructure
• Unauthorized configuration changes, new administrative accounts, or firmware modifications on Instant ON APs
• Access point reboots, crashes, or service restarts coinciding with malformed management packets

Detection Strategies

• Inspect management-plane traffic for CLI packets containing shell metacharacters such as ;, |, backticks, or $(...) sequences
• Correlate wireless infrastructure logs with network flow data to identify APs initiating unexpected egress traffic
• Monitor SNMP, syslog, and vendor telemetry from Instant ON APs for privilege escalation or configuration-change events

Monitoring Recommendations

• Forward Instant ON syslog and audit logs to a centralized SIEM for behavioral baselining
• Alert on any CLI access attempts sourced from user VLANs or guest wireless segments
• Track firmware versions across the AP fleet and flag devices running versions listed as vulnerable in the HPE bulletin

How to Mitigate CVE-2026-76724

Immediate Actions Required

• Apply the firmware update referenced in the HPE Security Bulletin to all affected Instant ON access points
• Restrict management-plane access to a dedicated administrative VLAN isolated from user and guest traffic
• Audit AP configurations and administrative accounts for unauthorized changes made prior to patching
• Rotate management credentials and shared secrets after remediation

Patch Information

HPE has issued fixed firmware for HPE Networking Instant ON access points. Consult the vendor bulletin hpesbnw05150en_us for the definitive list of affected models, vulnerable firmware versions, and remediated builds. Apply updates through the Instant ON cloud management portal or the local management interface according to HPE guidance.

Workarounds

• Place AP management interfaces on an isolated VLAN reachable only from trusted administrative hosts
• Enforce network access control (NAC) to prevent untrusted devices from associating with segments adjacent to AP management traffic
• Disable or restrict CLI access on affected APs where operationally feasible until firmware updates can be deployed

# Configuration example: restrict management access via ACL on upstream switch
# Replace <MGMT_SUBNET> and <ADMIN_HOST> with environment-specific values
ip access-list extended AP-MGMT-PROTECT
  permit ip host <ADMIN_HOST> <MGMT_SUBNET> 0.0.0.255
  deny   ip any <MGMT_SUBNET> 0.0.0.255 log
  permit ip any any