External risk intelligence

Firewall Script Execution Flaw Allows Remote System Compromise.

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-44108

The vulnerability affects a firewall, which is a device typically deployed at the network edge to mediate traffic between the internet and internal networks. Because it is an internet-facing gateway, a flaw that exposes internal services during shutdown makes it likely that these services would be reachable from the internet in common deployment patterns.

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

A recently identified flaw in our firewall's shutdown process creates a brief, exploitable window where internal systems could become accessible externally. This could potentially allow unauthorized remote access, leading to a full system compromise. The main concern is confirming relevance and exposure.

Firewall shutdown flaw allows remote access.
Critical infrastructure exposed during reboot.
Confirm relevance and potential exposure.

Attack Path

How an attacker could exploit the issue

Attackers can exploit a flaw in the system's shutdown process to temporarily bypass security controls. This creates a brief window where internal services, normally protected by the firewall, become accessible from the outside. An unauthenticated remote attacker could then leverage this exposure to gain full control of the system.

No special access required.
Triggered during system shutdown.
Full system compromise possible.

Live Threat

Current exploitation, exposure, and threat context

A flaw in script execution order during shutdown could allow an unauthenticated remote attacker to access internal services when the firewall is temporarily terminated. This could lead to a full system compromise.

Internal services could be exposed.
Attacker connects to services during shutdown.
Full system compromise may occur.

Operational Fix

Recommended remediation, mitigation, and detection steps

This critical vulnerability affects firewalls, creating a temporary window for unauthenticated remote attackers to access internal services during system shutdown. Identifying the specific firewall instances, confirming their external reachability and business criticality, and locating the accountable owner are the immediate priorities. Subsequently, a risk-based remediation plan, potentially involving vendor coordination or temporary mitigation, should be executed.

Firewall owners should address this vulnerability.
Verify firewall shutdown process and external access.
Plan remediation based on exposure and criticality.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the firewall software affected by CVE-2026-44108?

This firewall acts as a critical security gateway, sitting at the edge of a network to manage and filter traffic between the public internet and private internal systems. By controlling data flow, it prevents unauthorized access to internal resources. CVE-2026-44108 involves a component of this software responsible for managing system services during power-down cycles.

How does this vulnerability work?

The issue is a timing flaw categorized as CWE-696, which relates to incorrect behavior caused by improper execution order. In this case, the system terminates the firewall security services too early during the shutdown process. This creates a brief, unintended window where the protective shield drops before the rest of the system has fully powered off, leaving services exposed.

When does this security gap actually happen?

The vulnerability is strictly triggered during the system shutdown process. It does not exist while the firewall is operating normally under standard conditions. If the system is not actively powering down or restarting, the firewall remains active and protective. The risk is limited to the specific moment when the shutdown scripts are executing in the wrong order.

Is my network at risk according to Halo Surface Signal?

Halo Surface Signal flags this as a high-concern issue because firewalls are inherently internet-facing. Since the device mediates traffic at the network edge, any period where it drops its defenses makes it likely that internal services become reachable from the public internet. If your device is deployed in a standard edge configuration, it is effectively exposed during every reboot.

What should I do to address CVE-2026-44108?

Prioritize identifying all firewall instances in your environment that perform this shutdown sequence. Once located, confirm their connection to the internet and assess the criticality of the internal services they protect. Work with your internal infrastructure teams to manage the risk and coordinate with the product vendor for official updates or configuration guidance to correct the script execution order.

References

www.certvde.com/en/advisories/VDE-2026-008/

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.