CVE-2026-47147 in EmberZNet
Summary
by MITRE • 06/25/2026
In EmberZNet v9.0.2 and earlier, malformed OTA requests can drive the OTA server parser into out-of-bounds reads. A limited amount of data from RAM is read back to the requester. The size and location of this data is limited. These requests must come from a device that has already joined the network. Only devices supporting the OTA Server cluster may be impacted.
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Analysis
by VulDB Data Team • 06/25/2026
This vulnerability exists within EmberZNet protocol stack version 9.0.2 and earlier implementations where the Over-The-Air (OTA) server component fails to properly validate incoming OTA request payloads. The flaw manifests as an out-of-bounds read condition in the parser logic responsible for processing OTA update requests, which occurs when malformed or improperly structured requests are received from network devices that have already established their network connection. The vulnerability is classified under CWE-125 as an out-of-bounds read, representing a memory safety issue where the parser accesses memory locations beyond its allocated buffer boundaries. This particular implementation flaw allows attackers to potentially extract small amounts of data from adjacent memory regions within the RAM, though the exact size and location of readable data remains constrained by the specific memory layout and parsing logic.
The operational impact of this vulnerability is significant within IoT environments where EmberZNet is deployed, particularly in smart home automation systems, industrial control networks, and other embedded device ecosystems that rely on OTA update capabilities. Attackers must first establish network membership to exploit this vulnerability, meaning they need to have a device successfully joined the network through legitimate authentication processes, which limits the attack surface but does not eliminate the risk entirely. The vulnerability specifically affects devices implementing the OTA Server cluster functionality, making it relevant primarily to gateway devices, coordinators, or other central management systems that serve as OTA update servers within Zigbee networks. This aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1566.002 for phishing via social engineering in the context of network reconnaissance and privilege escalation.
The security implications extend beyond simple data leakage, as the extracted memory contents could potentially include sensitive information such as cryptographic keys, session tokens, or internal state variables that might aid in further exploitation attempts. While the amount of readable data is limited, the vulnerability creates a potential information disclosure vector that attackers can leverage to gain insights into the system's operational state and memory structure. Organizations should implement immediate mitigations including firmware updates to versions 9.0.3 or later where the parser validation has been enhanced to prevent malformed requests from triggering out-of-bounds reads. Network segmentation practices and access controls should be reinforced to limit device membership privileges, while monitoring systems should be deployed to detect anomalous OTA request patterns that might indicate exploitation attempts. The vulnerability demonstrates the importance of proper input validation in embedded systems and highlights how seemingly minor parsing flaws can create significant security risks in IoT ecosystems where device authentication and authorization processes may be bypassed by attackers who gain network membership through legitimate means.