External risk intelligence

FileX RAM Disk Driver Buffer Overflow leads to Remote Execution.

CVE advisorySeverity: CRITICAL (CVSS 9.2)

CVE-2025-55089

Eclipse ThreadX FileX is an embedded file system component typically used within real-time operating systems for constrained devices or internal system firmware. While it processes network packets, it is rarely deployed as a public-facing service and usually operates within isolated or embedded environments rather than as an internet-exposed application or gateway.

Memory Corruption

Eclipse Threadx Filex

before 6.4.2

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory concerns a critical vulnerability in the FileX module of Eclipse Foundation ThreadX. The issue, a buffer overflow in the RAM disk driver, could potentially allow for remote code execution if a specially crafted sequence of network packets is received. The primary concern is to confirm if this technology is in use within your environment and assess any potential exposure.

A memory flaw could enable remote code execution.
It affects embedded file system components.
Confirm relevance and potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit a buffer overflow vulnerability in the FileX RAM disk driver by sending a specially crafted sequence of network packets. This could allow for remote code execution on the affected system.

Network access required.
Vulnerable file driver triggered.
Remote code execution risk.

Live Threat

Current exploitation, exposure, and threat context

A buffer overflow in the FileX RAM disk driver could allow an attacker to execute arbitrary code remotely by sending a specially crafted sequence of network packets. This could impact the integrity and availability of the system running the affected component.

System file integrity could be compromised.
Remote code execution is possible via crafted packets.
Attacker may gain unauthorized system control.

Operational Fix

Recommended remediation, mitigation, and detection steps

Teams responsible for embedded systems and real-time operating environments should prioritize addressing this vulnerability. The initial steps involve identifying all instances of the affected component, confirming its network reachability and criticality to business operations, and then locating the specific product or system owner accountable for its management. Remediation planning should be risk-based and consider the unique deployment context of embedded technologies.

Identify accountable product or system owners.
Verify network exposure and business criticality.
Plan vendor-coordinated, risk-based remediation.

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 Eclipse ThreadX FileX?

FileX is a high-performance, embedded file system component designed for the Eclipse ThreadX real-time operating system. Developers use it to manage file storage and data organization within resource-constrained devices, such as industrial controllers, IoT sensors, and medical equipment firmware.

What is the CVE-2025-55089 weakness?

This vulnerability is a buffer overflow, which belongs to the CWE-119 class of memory safety issues. It occurs when a program writes more data to a memory buffer than it can hold, overwriting adjacent memory. In this case, the flaw exists within the RAM disk driver component of FileX, potentially allowing unauthorized code execution.

How is the FileX RAM disk buffer overflow triggered?

An attacker triggers this bug by sending a specifically crafted sequence of network packets to a device using the vulnerable FileX module. The issue is strictly contained within the file system driver's packet processing logic; simply having the component present is not enough if it does not receive these malicious network inputs.

Do I need to worry about CVE-2025-55089?

Halo Surface Signal indicates that while this is a critical remote execution risk, it is unlikely to affect typical internet-facing servers. FileX is generally used in embedded firmware within isolated or internal system environments, meaning it is rarely exposed directly to the public internet.

How should I respond if I use FileX?

First, conduct an inventory to locate all devices running FileX versions prior to 6.4.2. Once identified, evaluate whether the device is reachable over a network and determine its role in your operations. Finally, coordinate with your system owners or hardware vendors to plan a path toward updating the affected firmware.

References

github.com/eclipse-threadx/filex/security/advisories/GHSA-467v-6…

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.