CVE-2025-58300 is a stack-based buffer overflow vulnerability identified in the device management module of Huawei's HarmonyOS, specifically affecting versions 5.0.1 and 5.1.0. This vulnerability arises when the software improperly handles input data, allowing an attacker to overwrite parts of the stack memory. Such a buffer overflow can corrupt the execution flow, potentially causing the system or affected service to crash, leading to denial of service (DoS). The vulnerability does not compromise confidentiality or integrity, as it does not allow arbitrary code execution or data leakage. The CVSS 3.1 vector indicates that exploitation requires local access (AV:L), with low attack complexity (AC:L), no privileges (PR:N), and no user interaction (UI:N). The scope remains unchanged (S:U), and the impact is limited to availability (A:H), with no impact on confidentiality (C:N) or integrity (I:N). No known exploits have been reported in the wild, and no official patches have been released yet. The vulnerability was reserved in late August 2025 and published in October 2025. Given the nature of the flaw, attackers with local access could trigger crashes in the device management module, potentially disrupting device operations or services relying on HarmonyOS. This could affect IoT devices, smartphones, or other embedded systems running the vulnerable versions of HarmonyOS. The absence of known exploits suggests that active exploitation is not yet widespread, but the vulnerability should be addressed proactively.

For European organizations, the primary impact of CVE-2025-58300 is the potential disruption of services and device availability. Organizations relying on Huawei HarmonyOS devices for critical infrastructure, IoT deployments, or communication systems may experience service outages or degraded performance if the vulnerability is exploited. Although the vulnerability does not allow data theft or system takeover, denial of service conditions can affect operational continuity, especially in sectors such as telecommunications, manufacturing, and smart city deployments where Huawei devices are prevalent. The requirement for local access limits remote exploitation, reducing the risk from external attackers but increasing concern for insider threats or compromised local networks. The lack of patches means organizations must implement interim mitigations to reduce exposure. Failure to address this vulnerability could lead to operational downtime, impacting business processes and potentially causing financial and reputational damage. The impact is heightened in environments with high device density or critical reliance on HarmonyOS-based systems.

Given the absence of official patches, European organizations should implement specific mitigations to reduce risk. First, restrict local access to devices running vulnerable HarmonyOS versions by enforcing strict physical security and network segmentation to limit who can connect to these devices. Employ device hardening techniques such as disabling unnecessary services and interfaces related to device management modules. Monitor device logs and system behavior for signs of crashes or abnormal activity indicative of exploitation attempts. Implement strict access controls and authentication mechanisms to prevent unauthorized local access. Where possible, deploy updated versions of HarmonyOS once patches become available and prioritize patch management for affected devices. Additionally, conduct regular security audits and vulnerability assessments focusing on Huawei devices to identify and remediate exposure. For critical environments, consider deploying intrusion detection systems capable of recognizing anomalous behavior related to buffer overflow exploitation attempts. Engage with Huawei support channels to obtain timely updates and guidance. Finally, develop incident response plans that include scenarios involving denial of service on HarmonyOS devices to minimize operational impact.