CVE-2025-66328 identifies a race condition vulnerability classified under CWE-362 within the network management module of Huawei's HarmonyOS version 5.0.1. This vulnerability occurs due to improper synchronization when multiple threads concurrently access shared resources, leading to unpredictable behavior and potential system instability. Specifically, the flaw can be triggered locally without requiring authentication or user interaction, making it accessible to low-privileged attackers with local access. The race condition can cause corruption or inconsistent state within the network management processes, potentially resulting in denial-of-service (DoS) conditions that affect system availability. The CVSS 3.1 base score of 8.4 indicates a high severity, with a vector showing local attack vector (AV:L), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H). Although no exploits have been reported in the wild yet, the vulnerability poses a significant risk due to the critical role of network management in device operation and connectivity. The absence of available patches at the time of publication necessitates immediate attention to mitigate potential exploitation risks. Given Huawei's widespread use in telecommunications and IoT devices, this vulnerability could have broad implications if exploited.

For European organizations, the impact of CVE-2025-66328 is substantial, particularly for those relying on Huawei HarmonyOS devices in telecommunications, IoT deployments, and critical infrastructure. Exploitation could lead to denial-of-service conditions, disrupting network management functions and causing outages or degraded service availability. This disruption can affect business continuity, especially in sectors like telecom operators, smart city infrastructure, and industrial control systems where HarmonyOS devices are deployed. The high impact on confidentiality and integrity also suggests potential for data corruption or leakage during exploitation, further increasing risk. Given the local attack vector, insider threats or compromised internal systems could leverage this vulnerability to escalate disruptions. The lack of known exploits currently provides a window for proactive mitigation, but the high severity score underscores the urgency for European entities to assess their exposure and implement controls to prevent exploitation.

1. Monitor Huawei's official security advisories closely and apply patches or updates for HarmonyOS 5.0.1 as soon as they become available to address this race condition vulnerability. 2. Restrict local access to devices running HarmonyOS, especially limiting access to network management modules to trusted personnel and systems only. 3. Implement strict network segmentation and access controls to minimize the risk of local attackers gaining access to vulnerable devices. 4. Deploy host-based intrusion detection systems (HIDS) and continuous monitoring tools to detect anomalous behavior indicative of race condition exploitation attempts, such as unexpected process crashes or network management failures. 5. Conduct regular security audits and code reviews for custom applications interfacing with HarmonyOS network modules to identify and remediate potential concurrency issues. 6. Educate internal staff about the risks of local access vulnerabilities and enforce strong endpoint security policies to reduce insider threat risks. 7. Consider temporary compensating controls such as disabling non-essential network management features or services until patches are applied. 8. Collaborate with Huawei support channels for guidance and early access to fixes or mitigations.