External risk intelligence

PROFINET Buffer Overflow Allows Unauthenticated Remote Code Execution.

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2025-41769

PROFINET is an industrial Ethernet protocol designed for automation and control systems within internal factory floor networks. It is not intended for public internet exposure and is typically deployed behind strict network segmentation, making it very unlikely to be reachable from the public internet in common, secure industrial deployments.

Buffer Overflow

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This vulnerability affects a service used in industrial automation and control systems, potentially allowing unauthorized remote access to reboot devices or execute commands. While the technology is critical for operations, the main concern is confirming if these specific industrial systems are exposed in a way that makes them reachable.

Unauthenticated remote attackers can cause reboots or run code.
Protects operational technology from disruption.
Confirm relevance and exposure of industrial systems.

Attack Path

How an attacker could exploit the issue

An unauthenticated attacker on the network could reach the device's PROFINET service, which is vulnerable due to a buffer overflow in its default configuration. This exposure could allow the attacker to reboot the device or run their own code.

Entry condition: Attacker is on the same network.
Trigger point: Sending specially crafted data to PROFINET service.
Resulting risk: Device reboot or arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated remote attacker to impact the availability or integrity of an industrial control device. When the PROFINET service is accessible over a network, an attacker could potentially trigger a device reboot or execute arbitrary code.

Device availability and integrity at risk.
Exploitable when PROFINET is network-accessible.
Reboot device or execute arbitrary code.

Operational Fix

Recommended remediation, mitigation, and detection steps

Given this vulnerability affects the PROFINET service on a device, the primary responsibility likely lies with the industrial control system (ICS) or operational technology (OT) teams who manage these devices and their network segmentation. Infrastructure teams may also be involved if the PROFINET service relies on underlying network hardware. The first practical step is to identify all PROFINET devices, confirm their network exposure, determine their criticality to operations, and assign ownership for remediation planning.

Own by ICS/OT and Infrastructure teams.
Verify network reachability and device criticality.
Plan remediation and vendor coordination.

Supplementary metadata

CVSS vector

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Frequently asked questions

What is the PROFINET service mentioned in CVE-2025-41769?

PROFINET is an industrial Ethernet communication protocol used to exchange data between controllers, sensors, and actuators in automation and control systems. It acts as the digital nervous system for factory floors, enabling real-time coordination of machinery. Because this protocol is foundational for industrial operations, the affected service handles critical commands that keep hardware functioning precisely.

What does a buffer overflow mean for this device?

This vulnerability is classified as CWE-120, which occurs when a program writes more data to a memory buffer than it can hold, overwriting adjacent memory. In CVE-2025-41769, sending specifically crafted data to the PROFINET service exploits this memory flaw. This allows an attacker to disrupt device stability, forcing a reboot, or potentially gain control by running unauthorized code.

How can an attacker trigger this vulnerability?

An attacker triggers this bug by sending malicious data packets directly to the device's PROFINET service. The vulnerability exists in the default configuration, meaning no special authentication is required. Note that this cannot be triggered by simply browsing a website or interacting with unrelated services; the attacker must be able to communicate directly with the PROFINET service over the network.

Is my device at risk if it is not on the public internet?

Halo Surface Signal indicates that PROFINET is designed for internal factory networks, making public internet exposure very unlikely. However, risk remains if an attacker gains access to your internal network or if the device is inadvertently bridged to an exposed segment. You should care if your industrial systems are reachable from any network where unauthorized users or compromised devices reside.

What should I do first to manage this risk?

Your first step is to perform an inventory of all PROFINET-enabled devices in your environment. Once identified, verify their network segmentation to ensure they are isolated from unauthorized traffic. Coordinate with your operational technology teams to confirm the criticality of these devices and prioritize a remediation plan, such as applying vendor-provided updates once they become available.

References

phoenixcontact.csaf-tp.certvde.com/.well-known/csaf/white/2026/vde-2025-056.json

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.