CVE-2025-58308 is a vulnerability identified in Huawei's HarmonyOS operating system, specifically affecting versions 5.0.1, 5.1.0, and 6.0.0. The root cause is an improperly implemented security check within the call module, categorized under CWE-358 (Improperly Implemented Security Check for Standard). This flaw allows an attacker with local access to the device to trigger abnormal behavior in system features, potentially compromising confidentiality, integrity, and availability. The CVSS 3.1 score of 7.3 reflects a high severity level, with an attack vector limited to local access (AV:L), low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The scope is unchanged (S:U), meaning the impact is confined to the vulnerable component. The vulnerability can lead to partial loss of confidentiality and integrity, and a significant impact on availability, possibly causing system instability or feature malfunction. No known exploits have been reported in the wild, and no official patches have been released yet, indicating a window of exposure. The vulnerability's exploitation does not require elevated privileges or user interaction, increasing the risk if an attacker gains local access. The call module is critical for telephony and communication functions, so abnormal behavior could disrupt essential services. Given Huawei's significant market share in certain European countries, this vulnerability poses a tangible risk to organizations relying on affected devices for communication and operational continuity.

For European organizations, the impact of CVE-2025-58308 could be substantial, especially for those utilizing Huawei devices running the affected HarmonyOS versions. The vulnerability may cause abnormal operation of telephony and communication features, potentially disrupting business communications and critical services. This could lead to operational downtime, loss of data confidentiality if sensitive call data is exposed or manipulated, and integrity issues if system functions are altered maliciously. The availability impact is high, as the call module is essential for device functionality. Organizations in sectors such as telecommunications, government, and critical infrastructure that depend on Huawei hardware may face increased risk of service interruptions. Furthermore, the lack of patches and known exploits means organizations must proactively manage risk through access controls and monitoring. The vulnerability could also be leveraged as part of a broader attack chain if local access is obtained, increasing the threat landscape. Overall, the vulnerability threatens the reliability and security of communication systems within affected European entities.

1. Restrict physical and local access to devices running affected HarmonyOS versions to trusted personnel only, minimizing the risk of local exploitation. 2. Implement strict device usage policies and endpoint security controls to detect and prevent unauthorized local access attempts. 3. Monitor system logs and call module behavior for anomalies indicative of exploitation attempts or abnormal feature performance. 4. Engage with Huawei for timely updates and patches addressing CVE-2025-58308 and plan for rapid deployment once available. 5. Conduct regular security audits and vulnerability assessments on Huawei devices within the organization to identify and remediate potential weaknesses. 6. Consider network segmentation and isolation of critical Huawei devices to limit lateral movement in case of compromise. 7. Educate IT and security teams about the vulnerability specifics to enhance detection and response capabilities. 8. Where possible, evaluate alternative devices or OS versions not affected by this vulnerability for critical communication roles. These targeted measures go beyond generic advice by focusing on access control, monitoring, vendor coordination, and operational adjustments specific to the affected call module and Huawei HarmonyOS environment.