CVE-2026-3631 in COMMGR2
Summary
by MITRE • 03/09/2026
Delta Electronics COMMGR2 has
Buffer Over-read DoS vulnerability.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 03/15/2026
The Delta Electronics COMMGR2 device presents a critical buffer over-read vulnerability that fundamentally compromises system stability and availability. This vulnerability exists within the device's communication management framework, where improper input validation allows attackers to trigger memory access violations that result in system crashes and denial of service conditions. The flaw specifically manifests when the device processes malformed input data through its communication protocols, causing the system to read memory locations beyond the allocated buffer boundaries. Such over-read conditions can be exploited by remote attackers who send specially crafted packets or commands to the device, leading to unpredictable system behavior and complete service disruption.
The technical implementation of this vulnerability stems from inadequate bounds checking mechanisms within the COMMGR2 firmware architecture. When processing incoming network traffic or communication commands, the system fails to properly validate the length and content of input data before attempting to copy or process it into local memory buffers. This classic buffer over-read scenario creates opportunities for attackers to manipulate memory access patterns and force the device into a crash state. The vulnerability falls under the Common Weakness Enumeration category of CWE-125, which specifically addresses out-of-bounds read conditions in software implementations. The device's communication stack appears to lack proper input sanitization routines that would detect and reject malformed data before it reaches critical processing functions.
The operational impact of this vulnerability extends beyond simple service disruption to encompass potential business continuity risks for organizations relying on Delta Electronics COMMGR2 devices. Network administrators may experience unexpected downtime across critical infrastructure components, particularly in industrial environments where these devices manage communication flows between various network segments. The denial of service condition can persist until manual intervention occurs, requiring system restarts or firmware updates to restore normal operations. Organizations utilizing these devices in mission-critical applications face significant risk of operational disruption, especially when considering that the vulnerability can be exploited remotely without requiring authentication credentials. The attack surface is particularly concerning given that communication management devices often serve as central points of network control and monitoring.
Mitigation strategies for this vulnerability must address both immediate operational needs and long-term security posture improvements. Organizations should implement network segmentation controls to limit access to COMMGR2 devices, ensuring that only authorized management systems can communicate with these critical components. Network access control lists and firewall rules should be configured to restrict communication ports and protocols used by the device, reducing the potential attack surface. Firmware updates from Delta Electronics should be prioritized as the primary remediation measure, as these patches typically include enhanced input validation and memory management controls. Additionally, security monitoring solutions should be deployed to detect anomalous communication patterns that might indicate exploitation attempts. The vulnerability aligns with ATT&CK technique T1499.004 which covers network denial of service attacks, and organizations should consider implementing intrusion detection systems capable of identifying and alerting on suspicious packet patterns targeting buffer over-read vulnerabilities. Regular security assessments and vulnerability scanning should be conducted to identify similar issues within the broader network infrastructure, as this type of vulnerability often indicates broader architectural weaknesses in input validation processes.