CVE-2025-54624 is a medium-severity vulnerability identified in Huawei's HarmonyOS, specifically affecting versions 5.0.1 and 5.1.0. The vulnerability is categorized under CWE-275, which relates to permission issues. The technical root cause is an unexpected injection event vulnerability within the multimodalinput module of HarmonyOS. This module likely handles multiple input types (e.g., touch, voice, gestures) and the injection event suggests that unauthorized or malformed input events can be introduced unexpectedly. The CVSS 3.1 base score is 5.7, indicating a medium severity level. The vector string (CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N) reveals that the attack requires adjacent network access (AV:A), low attack complexity (AC:L), and low privileges (PR:L) but no user interaction (UI:N). The scope is unchanged (S:U), and the impact is high on confidentiality (C:H), but no impact on integrity (I:N) or availability (A:N). However, the description states the impact may affect availability, which suggests some discrepancy or that availability impact is possible in some scenarios. No known exploits are reported in the wild, and no patches have been linked yet. The vulnerability allows an attacker with low privileges and network adjacency to inject unexpected events into the multimodalinput module, potentially leading to unauthorized access to sensitive data (confidentiality impact) or disruption of normal input processing, which could degrade system availability. Since the vulnerability does not require user interaction and has low complexity, it could be exploited in targeted attacks or lateral movement scenarios within a network. Given Huawei HarmonyOS's deployment primarily in IoT devices, smartphones, and embedded systems, this vulnerability could be leveraged to compromise device confidentiality or cause denial of service conditions in affected devices.

For European organizations, the impact of CVE-2025-54624 depends on the extent of HarmonyOS device usage within their infrastructure or supply chain. Enterprises using Huawei devices running HarmonyOS 5.0.1 or 5.1.0 in operational technology (OT), IoT deployments, or mobile endpoints could face confidentiality breaches if attackers exploit this vulnerability. The high confidentiality impact means sensitive data processed or stored on these devices could be exposed. Additionally, the potential availability impact could disrupt critical business operations relying on these devices, especially in sectors like manufacturing, telecommunications, or smart city infrastructure where Huawei devices are integrated. The requirement for adjacent network access limits remote exploitation but does not eliminate risk in environments with shared networks or compromised internal segments. The low privilege requirement means that an attacker who has gained limited access to the network or device could escalate their capabilities or move laterally. The absence of known exploits reduces immediate risk but does not preclude future exploitation. European organizations should be aware of this vulnerability particularly if they operate in sectors with Huawei device deployments or have supply chain dependencies involving HarmonyOS devices.

1. Immediate mitigation should focus on network segmentation to limit adjacent network access to Huawei HarmonyOS devices, reducing the attack surface. 2. Implement strict access controls and monitoring on devices running HarmonyOS to detect unusual injection events or anomalous input behavior. 3. Apply principle of least privilege rigorously to limit the permissions of users and processes interacting with the multimodalinput module. 4. Engage with Huawei for official patches or updates addressing CVE-2025-54624 and prioritize deployment once available. 5. Conduct thorough inventory and risk assessment of all HarmonyOS devices within the organization to identify exposure. 6. Use endpoint detection and response (EDR) tools capable of monitoring input event anomalies and suspicious network activity around these devices. 7. For critical environments, consider temporary isolation or replacement of vulnerable devices until patches are applied. 8. Train security teams to recognize signs of exploitation related to input injection attacks and prepare incident response plans accordingly.