CVE-2025-66555 is a critical vulnerability identified in AirKeyboard iOS App version 1.0.5, categorized under CWE-306 (Missing Authentication for Critical Function). The flaw allows unauthenticated remote attackers to inject arbitrary keystrokes into the victim's iOS device in real-time without requiring any user interaction or privileges. This means an attacker can gain full remote input control over the device, potentially executing commands, entering malicious input, or manipulating sensitive data. The vulnerability is exploitable over the network (AV:N), with low attack complexity (AC:L), no authentication or privileges required (PR:N), and no user interaction needed (UI:N). The impact on confidentiality is low, but integrity and availability impacts are high due to the ability to control input and disrupt device operations. The vulnerability does not require scope changes or special attack conditions, making it highly accessible to attackers. No patches or known exploits are currently available, but the risk is substantial given the app's functionality as a remote keyboard interface. The vulnerability was published on December 4, 2025, and assigned a CVSS 4.0 score of 8.8, reflecting its high severity. The lack of authentication on critical functions in the app's design is the root cause, emphasizing the need for robust access controls in remote input applications.

For European organizations, this vulnerability poses a significant threat to the security and integrity of iOS devices used within corporate environments. Attackers exploiting this flaw can remotely inject keystrokes, potentially leading to unauthorized command execution, data exfiltration, or disruption of critical business applications. The ability to control input without user interaction increases the risk of stealthy attacks that bypass traditional endpoint defenses. This could result in compromised confidential information, manipulation of financial or operational data, and interruption of business processes. Organizations relying on AirKeyboard for remote input or device management may face increased risk of insider threats or external attackers gaining foothold. The vulnerability also threatens compliance with data protection regulations such as GDPR, as unauthorized access and data manipulation could lead to breaches. The absence of a patch means organizations must implement interim controls to mitigate exposure. The impact extends to mobile device management (MDM) systems and any workflows dependent on secure input, potentially affecting productivity and trust in mobile platforms.

1. Immediately restrict or disable the use of AirKeyboard iOS App version 1.0.5 within corporate environments until a security patch is released. 2. Monitor network traffic for unusual or unauthorized connections to devices running the vulnerable app, focusing on unexpected remote input activity. 3. Employ mobile device management (MDM) solutions to enforce application whitelisting and prevent installation or execution of unpatched versions of AirKeyboard. 4. Educate users about the risks of using remote input apps from untrusted sources and encourage reporting of suspicious device behavior. 5. Implement network segmentation to isolate iOS devices running AirKeyboard from critical infrastructure to limit attack surface. 6. Once available, promptly apply vendor patches or updates addressing the authentication flaw. 7. Consider deploying endpoint detection and response (EDR) tools capable of detecting anomalous input injection or command execution patterns. 8. Review and tighten access controls and authentication mechanisms for all remote input or control applications to prevent similar vulnerabilities.