CVE-2026-51535 in OpENer
Summary
by MITRE • 07/09/2026
In OpENer 2.3.0 (commit 76b95cf), a resource exhaustion (Denial of Service) vulnerability exists in its network processing loop.
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Analysis
by VulDB Data Team • 07/09/2026
The vulnerability in OpENer 2.3.0 represents a critical resource exhaustion flaw that can lead to denial of service conditions within industrial control systems. This issue manifests in the network processing loop where the software fails to properly handle incoming network traffic, creating a condition where legitimate requests can be overwhelmed by malformed or excessive data packets. The vulnerability stems from inadequate input validation and resource management within the communication handling mechanisms of the industrial Ethernet protocol implementation.
The technical flaw operates through a lack of proper bounds checking and resource allocation controls in the network processing loop. When malformed packets or excessive traffic volumes are received, the system does not appropriately throttle or reject these inputs, causing the processing loop to consume increasing amounts of memory and CPU resources. This behavior aligns with CWE-400 which categorizes resource exhaustion vulnerabilities as those that allow attackers to consume system resources through improper input handling. The flaw essentially creates a scenario where legitimate network operations become impossible as system resources are consumed by malicious or malformed traffic patterns.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the integrity of industrial control systems where OpENer is deployed. In industrial environments, such denial of service conditions can lead to production halts, safety system failures, and cascading effects throughout connected equipment. The vulnerability affects systems that rely on real-time communication protocols where network availability is critical for operational continuity. Attackers could exploit this weakness by sending specially crafted network packets that cause the system to continuously process invalid data, eventually leading to complete service unavailability.
Mitigation strategies should focus on implementing robust input validation and rate limiting mechanisms within the network processing loop. Organizations should deploy network segmentation and access control measures to limit exposure to potentially malicious traffic sources. The implementation of proper resource management controls including memory allocation limits and connection throttling can help prevent the exhaustion scenario from occurring. Additionally, regular monitoring of system resource consumption and network traffic patterns should be established to detect anomalous behavior indicative of exploitation attempts. This vulnerability highlights the importance of following secure coding practices as outlined in the OWASP Secure Coding Guidelines and aligns with ATT&CK technique T1499 which covers network denial of service attacks targeting industrial control systems.