CVE-2025-54619 is a medium-severity vulnerability identified in Huawei's HarmonyOS versions 5.0.1 and 5.1.0. The flaw is classified under CWE-664, which pertains to improper control of a resource through its lifetime. Specifically, this vulnerability arises from an iterator failure issue within the multi-mode input module of HarmonyOS. An iterator is a programming construct used to traverse elements in a data structure, and improper handling can lead to resource mismanagement or unexpected behavior. In this case, the iterator failure can cause the system to mishandle resources, potentially leading to instability or crashes. The vulnerability requires local access with low privileges (AV:L/PR:L), does not require user interaction (UI:N), and affects confidentiality, integrity, and availability to a limited extent (C:L/I:L/A:L). Exploitation could result in denial of service conditions by causing the affected module to fail, thereby impacting system availability. No known exploits are currently in the wild, and no patches have been published yet. The vulnerability was reserved on July 28, 2025, and published on August 6, 2025, indicating recent discovery and disclosure. Given the nature of the flaw, it primarily affects the stability and availability of the input subsystem in HarmonyOS devices, which may include smartphones, IoT devices, and other embedded systems running this OS.

For European organizations, the impact of CVE-2025-54619 depends largely on the deployment scale of HarmonyOS devices within their infrastructure. Enterprises or service providers using Huawei devices running affected HarmonyOS versions could face availability issues if the vulnerability is exploited, potentially leading to denial of service on critical input modules. This could disrupt user interactions or automated input processes, affecting productivity and operational continuity. Although the confidentiality and integrity impacts are limited, the availability impact could be significant in environments relying on HarmonyOS for critical functions, such as telecommunications, smart city infrastructure, or industrial IoT deployments. Additionally, organizations in Europe that provide support or services for Huawei devices might experience increased support costs and reputational damage if devices become unstable. The lack of known exploits reduces immediate risk, but the absence of patches necessitates caution. Given the local access requirement, attackers would need some level of access to the device, which may limit remote exploitation but does not eliminate insider threats or malware-based local attacks.

To mitigate CVE-2025-54619 effectively, European organizations should first inventory all Huawei devices running HarmonyOS versions 5.0.1 and 5.1.0 within their environment. Until an official patch is released, organizations should implement strict access controls to limit local access to these devices, including enforcing strong authentication and minimizing the number of users with local privileges. Monitoring and logging local access attempts can help detect potential exploitation attempts. Network segmentation should be used to isolate critical HarmonyOS devices from less trusted network segments to reduce the risk of lateral movement. Organizations should also engage with Huawei support channels to obtain information on forthcoming patches or workarounds. Where possible, consider deploying endpoint protection solutions capable of detecting anomalous behavior related to iterator failures or input module crashes. Finally, educating users about the risks of local exploitation and maintaining up-to-date backups can help reduce the impact of potential denial of service conditions.