External risk intelligence

HPE Networking Instant ON APs Uncontrolled Format String Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-76722

The vulnerability affects HPE Networking Instant ON access points. These devices are network infrastructure appliances commonly deployed as edge or gateway services. Given their role in managing network traffic and providing connectivity, they are frequently positioned where they are reachable via the local network or internet-facing management interfaces.

Remote Code Execution

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

An uncontrolled format string vulnerability has been identified in HPE Networking Instant ON access points, potentially allowing remote attackers to execute commands and cause a denial-of-service or remote code execution.

Input handling flaws could let attackers run commands.
Network devices are critical infrastructure.
Confirm exposure for potential command execution risks.

Attack Path

How an attacker could exploit the issue

An attacker could target an exposed network interface on HPE Networking Instant ON access points. By sending specially crafted data to this interface, they could trigger a flaw in how the system processes text, potentially allowing them to execute commands as if they were a system administrator. This could lead to the device becoming unresponsive or being taken over by the attacker.

Requires network access.
Vulnerable network interface processing.
Risk of arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

An uncontrolled format string vulnerability in HPE Networking Instant ON access points could allow an unauthenticated remote attacker to execute arbitrary commands on the device's host. This could lead to a denial-of-service or, when supported by the advisory, potential remote code execution.

System commands and device control.
Remote unauthenticated network access.
Denial-of-service or code execution.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in HPE Networking Instant ON APs necessitates action from teams responsible for network infrastructure and device management. The immediate priority is to identify all deployed Instant ON APs, confirm their network exposure, and assess their criticality to business operations. Once accountable owners are identified, a risk-based remediation plan, potentially involving vendor coordination, can be developed.

Network or infrastructure teams own remediation.
Verify AP network exposure and business criticality.
Plan and coordinate vendor-supported updates.

Supplementary metadata

CVSS vector

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Frequently asked questions

What are HPE Networking Instant ON APs?

These are specialized network infrastructure devices designed to provide wireless connectivity for small businesses and home offices. They function as gateways or access points, managing data traffic between wireless clients and the wired network. Because they sit at the edge of the network, they act as the primary bridge for connectivity and often host management interfaces that allow administrators to configure network settings and monitor traffic flow.

What does an uncontrolled format string vulnerability mean for CVE-2026-76722?

This weakness, categorized as CWE-134, occurs when an application processes user-supplied input as a command string without proper validation. In the context of this CVE, if an attacker sends specially formatted text to a vulnerable interface, the system may misinterpret that data as an instruction to execute code. This can lead to the device crashing, becoming unresponsive, or allowing the attacker to run unauthorized commands with administrative privileges.

How can an attacker trigger this vulnerability?

An attacker triggers the flaw by sending crafted data packets to an exposed network interface on the device. Because the device handles this data incorrectly, no prior authentication is required to initiate the attack. Notably, standard administrative tasks or authorized user traffic do not trigger the bug; the vulnerability is specifically activated when the device processes malicious input designed to exploit the formatting logic.

Do I need to worry if my device is not on the public internet?

Yes, you should still evaluate your risk. According to Halo Surface Signal, these access points are often positioned as edge or gateway services. Even if a device is not directly exposed to the public internet, it may be reachable to anyone with access to your local network. If an attacker gains a foothold on another internal system, they could use that access to reach and target the management interface of these APs.

What is the first step to take if I use these access points?

Begin by creating an accurate inventory of all deployed HPE Networking Instant ON units in your environment. Once identified, verify their network configuration to determine if they are reachable from untrusted segments or the public internet. Assess the criticality of each device to your business operations and prepare to apply vendor-provided updates or configuration changes once they become available through official support channels.

References

support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05150en_us&docLo…

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.