Executive Summary

CVE-2025-41729 is a vulnerability in the Modbus interface of Janitza electronics GmbH devices UMG 96-PA and UMG 96-PA-MID+ with firmware versions earlier than 3.54. An unauthenticated remote attacker can send a specially crafted Modbus read command that causes a denial of service (DoS), making the device stop responding and its measurement functions cease until it is restarted. This is due to improper validation of input. [1]

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Impact Analysis

This vulnerability can impact you by causing a denial of service on affected devices, rendering them unavailable and stopping their measurement functionalities. This disruption can affect operations relying on these devices until they are restarted or patched. [1]

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Detection Guidance

Detection can involve monitoring for unusual Modbus read commands that cause the device to stop responding. Since the vulnerability is triggered by specially crafted Modbus read commands, network traffic analysis tools can be used to capture and inspect Modbus traffic for anomalies. Specific commands to detect this vulnerability are not provided in the resources. However, using tools like Wireshark to filter Modbus TCP traffic (e.g., filter: modbus) or using network intrusion detection systems configured to alert on abnormal Modbus read requests may help identify exploitation attempts. [1]

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Mitigation Strategies

Immediate mitigation steps include operating the affected devices within a closed network protected by a suitable firewall, restricting network access to only necessary components, and securing Modbus protocol communications to prevent unauthorized access. The definitive fix is to update the device firmware to version 3.54 or later, which resolves the vulnerability. [1]

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