External risk intelligence

Waterfall WF-500 OS Command Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2025-41277

The vulnerability resides in a WebUI component of a security appliance (Waterfall WF-500) that allows unauthenticated remote command execution. Such appliances, often acting as network security gateways or data diodes, are commonly deployed in edge or transit environments where the management interface or web-based configuration portal may be reachable from a broader network segment.

OS Command Injection

Waterfall Security Wf 500 Firmware

7.9.1.0_r2502171040 and earlier

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 critical vulnerability has been identified in Waterfall WF-500 devices, affecting their Console WebUI. This issue could allow unauthorized individuals to remotely execute commands on the affected systems, potentially impacting their operational integrity. The primary concern is to confirm if these devices are in use and if they are exposed to potential threats.

Attackers can run unauthorized commands remotely.
This affects critical security appliances.
Confirm use and exposure of affected devices.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this vulnerability by sending specially crafted network requests to the device's Console WebUI. Because no authentication is required, an unauthenticated remote attacker can trigger the flaw, potentially leading to the execution of arbitrary commands on the affected system.

No authentication required for attack.
Triggered via Console WebUI network requests.
Risk of arbitrary command execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated remote attacker to execute arbitrary operating system commands on affected devices. This could potentially impact the integrity and availability of the device's services and underlying system.

System commands on the device.
Remote unauthenticated access to WebUI.
Device service integrity and availability.

Operational Fix

Recommended remediation, mitigation, and detection steps

The Waterfall WF-500 hosts, specifically the Console WebUI, are susceptible to OS command injection, allowing unauthenticated remote attackers to execute arbitrary commands. Given the nature of this vulnerability on network security appliances, the platform or infrastructure teams responsible for the WF-500 deployment are likely accountable. The initial focus should be on inventorying all WF-500 devices, assessing their network exposure and criticality, and identifying the specific asset owners before planning remediation.

Platform or infrastructure teams should own the issue.
Verify WF-500 network exposure and criticality.
Plan remediation based on confirmed ownership and risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is the Waterfall WF-500 device?

The Waterfall WF-500 is a specialized network security appliance, often functioning as a data diode or network gateway. These devices are designed to protect critical infrastructure by strictly controlling data flow between networks of different security levels. They typically manage traffic via a dedicated Console WebUI, which serves as the primary interface for device configuration and operational monitoring.

What does CVE-2025-41277 mean by OS command injection?

This vulnerability is classified as CWE-78, which occurs when software fails to properly filter user-supplied input before passing it to the operating system. In the context of CVE-2025-41277, this allows a remote attacker to embed unauthorized system commands within a standard web request. When the Console WebUI processes this malicious input, the appliance executes those commands with the privileges of the web service, effectively letting an attacker take control of the device.

How can an attacker trigger this vulnerability?

An attacker triggers this flaw by sending specially crafted network requests directly to the Console WebUI of an affected Waterfall WF-500 unit. Crucially, the vulnerability does not require the attacker to have any valid user credentials or prior access to the system. It is not triggered by standard, legitimate administrative tasks; it requires a deliberate, malicious request designed to manipulate the underlying system commands.

Why is this CVE considered relevant to my network?

Halo Surface Signal indicates that because this vulnerability exists within a web-accessible management component, it poses a significant risk if that interface is reachable from broader network segments. Even if the appliance is intended for internal use, any connectivity between the management interface and a wider network increases the likelihood that an external actor could reach and exploit the device.

What steps should I take if I use Waterfall WF-500?

First, conduct an immediate inventory to locate all deployed Waterfall WF-500 units in your environment. Prioritize checking which devices have their Console WebUI accessible over the network. Once identified, work with your infrastructure or platform teams to restrict access to these management interfaces and verify the operational criticality of each unit while preparing to apply vendor-supplied updates or patches.

References

www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-41277

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.