CVE-2025-2403 in Relion 670
Summary
by MITRE • 06/24/2025
A denial-of-service vulnerability due to improper prioritization of network traffic over protection mechanism exists in Relion 670/650 and SAM600-IO series device that if exploited could potentially cause critical functions like LDCM (Line Distance Communication Module) to malfunction.
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Analysis
by VulDB Data Team • 06/27/2025
This vulnerability represents a critical design flaw in network traffic handling mechanisms within Relion 670/650 and SAM600-IO series industrial control devices. The issue stems from improper prioritization of network traffic flows, where the protection mechanisms fail to adequately distinguish between legitimate operational communications and potentially malicious traffic patterns. This fundamental flaw creates a scenario where normal network operations can inadvertently trigger protective responses that disable critical subsystems.
The technical implementation of this vulnerability manifests through the device's traffic processing algorithms that do not properly weight or sequence network packets according to their operational importance. When network traffic exceeds predetermined thresholds, the system's protection mechanisms activate and begin to prioritize defensive actions over maintaining operational continuity. This prioritization error specifically affects Line Distance Communication Module functionality, which serves as a critical communication pathway for device operation and monitoring. The flaw operates at the protocol handling level where incoming packets are processed without adequate differentiation between normal operational traffic and traffic patterns that might trigger false positive security alerts.
From an operational impact perspective, this vulnerability creates a significant risk to industrial control systems where reliability and continuous operation are paramount. When LDCM functionality malfunctions due to improper traffic prioritization, it can lead to complete loss of communication between control modules, potentially causing production line shutdowns, safety system failures, or operational disruptions that may require manual intervention to restore normal operations. The vulnerability is particularly concerning in environments where these devices are deployed as part of critical infrastructure or safety systems, where even brief communication interruptions could result in substantial financial losses or safety hazards.
The vulnerability aligns with CWE-200, which addresses improper information flow control in security systems, and demonstrates characteristics consistent with ATT&CK technique T1499.001 for network denial of service attacks. The improper prioritization mechanism creates a condition where legitimate network operations can be misinterpreted as malicious activity, leading to cascading failures in system functionality. This represents a classic case of security controls being implemented without proper consideration of operational requirements, where defensive mechanisms become counterproductive. The flaw also relates to CWE-399, which covers resource management errors, as the system's inability to properly manage network traffic prioritization leads to resource exhaustion or misallocation that affects critical functions.
Mitigation strategies should focus on implementing traffic shaping mechanisms that properly prioritize critical operational communications over general network traffic, establishing clear traffic classification rules that distinguish between operational and non-operational communications, and configuring the protection mechanisms with appropriate thresholds that do not trigger on normal operational traffic patterns. Network administrators should consider implementing traffic monitoring solutions that can identify when protection mechanisms are being incorrectly triggered and provide alerts when such conditions occur. Additionally, regular firmware updates should be implemented to address the root cause of the prioritization issue, and system administrators should conduct thorough testing of network traffic patterns to ensure that normal operations do not inadvertently trigger protective responses that disable critical functions.