CVE-2025-66555 is a vulnerability identified in AirKeyboard iOS App version 1.0.5, classified under CWE-306 (Missing Authentication for Critical Function). The flaw allows unauthenticated remote attackers to inject arbitrary keystrokes directly into the victim's iOS device in real-time without requiring any user interaction or prior authentication. This means an attacker can remotely control the input interface of the device, potentially executing commands, entering sensitive information, or manipulating applications and data. The vulnerability is exploitable over the network (AV:N) with low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The impact on confidentiality is low, but the impact on integrity and availability is high, as attackers can alter device behavior and disrupt normal operations. The vulnerability does not require scope change or authentication, making it highly accessible to attackers. Although no known exploits are reported in the wild yet, the severity score of 8.8 (CVSS 4.0) indicates a critical risk. The lack of a patch currently leaves users exposed. The vulnerability affects only version 1.0.5 of the AirKeyboard iOS App, which is a tool designed to enable keyboard input from other devices to iOS devices. The missing authentication on this critical function is a serious security oversight, allowing attackers to bypass intended security controls and gain full remote input control.

For European organizations, this vulnerability poses a significant risk to the confidentiality, integrity, and availability of iOS devices used within corporate environments. Attackers could remotely inject keystrokes to exfiltrate sensitive data, execute unauthorized commands, or disrupt business operations by manipulating device input. This is particularly concerning for sectors relying heavily on mobile devices for secure communications, such as finance, healthcare, and government. The ability to control input without user interaction increases the risk of stealthy attacks that evade detection. Additionally, compromised devices could serve as entry points for lateral movement within corporate networks. The absence of authentication means any attacker with network access to the vulnerable app can exploit this flaw, increasing the attack surface. The lack of a patch means organizations must rely on compensating controls, increasing operational complexity and risk exposure until remediation is available.

1. Immediate mitigation involves removing or disabling the AirKeyboard iOS App version 1.0.5 from all organizational devices until a vendor patch is released. 2. Implement network segmentation and firewall rules to restrict network access to devices running the vulnerable app, limiting exposure to untrusted networks. 3. Monitor network traffic and device input logs for unusual or unauthorized keystroke injection activity, employing anomaly detection tools where possible. 4. Educate users about the risks of installing or using untrusted input control applications and enforce strict app installation policies via Mobile Device Management (MDM) solutions. 5. Maintain up-to-date backups of critical data to mitigate potential data loss from malicious input actions. 6. Coordinate with the vendor for timely patch release and apply updates immediately upon availability. 7. Consider deploying endpoint detection and response (EDR) solutions capable of detecting abnormal input events or unauthorized remote control attempts. 8. Review and tighten iOS device security settings, including restricting app permissions and enabling device encryption and strong authentication mechanisms.