CVE-2026-47153 in EmberZNet
Summary
by MITRE • 06/25/2026
In EmberZNet v9.0.2 and earlier, a malformed Level Control Step command can terminate the process through a divide-by-zero fault. This command must come from a device that has already joined the network. Only devices supporting the Level Control cluster may be impacted.
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Analysis
by VulDB Data Team • 06/25/2026
The vulnerability described represents a critical divide-by-zero error in EmberZNet v9.0.2 and earlier versions that can lead to process termination through malformed Level Control Step commands. This issue occurs within Zigbee-based networking systems where devices communicate using the Zigbee Cluster Library protocols, specifically targeting the Level Control cluster functionality. The flaw demonstrates a classic software error pattern where improper input validation leads to arithmetic exceptions that crash the executing process.
The technical implementation of this vulnerability stems from insufficient parameter validation in the Level Control cluster's Step command processing logic. When a malformed Step command is received from a previously joined network device, the system attempts to perform division operations without proper boundary checking or exception handling. This divide-by-zero condition triggers an unhandled exception that terminates the process executing the Zigbee stack. The vulnerability requires that the attacking device be authenticated and part of the network, limiting its scope but not eliminating the risk. According to CWE-369, this represents a divide by zero weakness where a program attempts to perform a division operation with a zero divisor, leading to abnormal program termination.
The operational impact of this vulnerability extends beyond simple process termination, as it can disrupt network stability and potentially enable denial-of-service scenarios within Zigbee ecosystems. Network devices that rely on continuous operation for home automation, industrial control systems, or smart building management may experience service interruptions when malicious actors exploit this flaw. The attack vector requires network membership, meaning that unauthorized users cannot directly initiate the attack but must first gain legitimate access to the network through other means such as credential compromise or physical access to authorized devices. This aligns with ATT&CK technique T1078.004 for valid accounts and T1566.002 for spearphishing via social engineering.
Devices supporting the Level Control cluster are specifically impacted, which includes lighting controls, smart appliances, and other Zigbee-enabled products that utilize step-based dimming or level adjustment functionality. The vulnerability affects systems where devices must respond to Step commands from network coordinators or other authorized nodes, making it particularly concerning for commercial installations where continuous operation is critical. Security professionals should note that this represents a remote code execution risk when combined with other vulnerabilities, as process termination can be leveraged to disrupt network operations or potentially create conditions for further exploitation.
Mitigation strategies should focus on immediate firmware updates to EmberZNet versions that address the divide-by-zero condition and implement proper input validation procedures. Network administrators should also consider implementing additional monitoring to detect unusual Step command patterns and establish network segmentation to limit potential impact if an attacker gains access. The solution must include robust error handling for arithmetic operations and comprehensive testing of cluster command processing to prevent similar issues in other parts of the Zigbee stack. According to NIST SP 800-34, incident response procedures should be updated to address this type of vulnerability, while CWE-129 suggests implementing bounds checking and validation before performing mathematical operations that could lead to division by zero errors.
The broader implications for IoT security highlight the importance of proper input validation in embedded systems and the potential for seemingly minor software flaws to create significant operational risks. This vulnerability serves as a reminder that even well-established protocols like Zigbee require ongoing security assessment and that developers must implement comprehensive error handling mechanisms that prevent arithmetic exceptions from terminating critical processes. Organizations should conduct thorough vulnerability assessments of their Zigbee-based installations and ensure that firmware updates are applied promptly to address known security issues. The attack surface for such vulnerabilities is particularly concerning in environments where Zigbee networks control critical infrastructure or safety systems, where process termination could lead to more severe consequences than simple service disruption.