CVE-2025-58276 is a permission verification vulnerability identified in the home screen module of Huawei's HarmonyOS, affecting multiple versions from 2.0.0 through 4.3.1. The vulnerability is classified under CWE-264, which pertains to improper permissions, privileges, and access controls. Specifically, this flaw allows an attacker to bypass permission checks within the home screen component, potentially leading to unauthorized actions that impact system availability. According to the CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H), the vulnerability requires local access (AV:L), has low attack complexity (AC:L), requires no privileges (PR:N), and no user interaction (UI:N). The scope remains unchanged (S:U). The impact on confidentiality is low (C:L), no impact on integrity (I:N), but high impact on availability (A:H). This suggests that exploitation could cause denial of service or system crashes affecting the device's usability. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability's presence in the home screen module implies that it could be triggered by local applications or processes interacting with the user interface layer, potentially leading to system instability or denial of service conditions without requiring user interaction or elevated privileges.

For European organizations, the impact of CVE-2025-58276 could be significant in environments where HarmonyOS devices are deployed, particularly in sectors relying on Huawei hardware and software ecosystems such as telecommunications, manufacturing, or enterprise mobile deployments. The high availability impact means that critical devices could become unresponsive or crash, disrupting business operations, communications, or service delivery. Since the vulnerability does not require user interaction or privileges, it could be exploited by malicious local applications or insiders, increasing the risk in environments with less stringent device control policies. The low confidentiality impact reduces the risk of data leakage, but the potential for denial of service could affect operational continuity, especially in organizations using HarmonyOS-powered devices for critical tasks or IoT integrations. Additionally, the lack of known exploits currently provides a window for proactive mitigation before active exploitation emerges.

Given the absence of official patches, European organizations should implement specific mitigations beyond generic advice: 1) Restrict installation and execution of untrusted or third-party applications on HarmonyOS devices, especially those with local access to the home screen module. 2) Employ mobile device management (MDM) solutions to enforce strict application whitelisting and monitor device behavior for anomalies indicative of exploitation attempts. 3) Limit physical and local access to devices by enforcing strong access controls and user authentication to reduce the risk of local exploitation. 4) Regularly audit and update device firmware and HarmonyOS versions as Huawei releases patches or security updates addressing this vulnerability. 5) Educate users and administrators about the risks of installing unauthorized software and the importance of reporting unusual device behavior promptly. 6) For critical deployments, consider network segmentation and isolation of HarmonyOS devices to contain potential availability impacts. 7) Monitor Huawei security advisories and CVE databases for updates or exploit disclosures to respond swiftly.