CVE-2025-46303 is a vulnerability in Apple iOS and iPadOS that arises from improper bounds checking in the handling of Human Interface Devices (HIDs). A malicious HID device can exploit this flaw to cause an unexpected process crash, impacting the availability of affected processes. The vulnerability is categorized under CWE-119, indicating a classic buffer or memory bounds issue. Exploitation requires no privileges but does require user interaction, such as connecting or interacting with a malicious HID device. The CVSS v3.1 score is 5.7 (medium severity), reflecting the limited impact on confidentiality and integrity but significant availability disruption. Apple has addressed this vulnerability in iOS 18.7.5, iPadOS 18.7.5, and corresponding updates for macOS, tvOS, visionOS, and watchOS. The fix involves improved bounds checking to prevent the crash condition. No public exploits or active attacks have been reported to date. This vulnerability primarily affects Apple mobile platforms and related operating systems, emphasizing the need for patching in environments relying on these devices.

The primary impact of CVE-2025-46303 is on the availability of processes on Apple iOS and iPadOS devices. A malicious HID device can cause targeted processes to crash unexpectedly, potentially disrupting user workflows or critical applications. While confidentiality and integrity are not directly compromised, repeated or targeted exploitation could lead to denial-of-service conditions, affecting business continuity and user experience. Organizations relying heavily on Apple mobile devices for operational or strategic purposes may face interruptions. The requirement for user interaction limits remote exploitation but does not eliminate risk in environments where untrusted peripherals may be connected. This vulnerability could be leveraged in targeted attacks or by malicious insiders to disrupt device functionality. The absence of known exploits in the wild reduces immediate risk but does not preclude future exploitation once the vulnerability details are widely known.

To mitigate CVE-2025-46303, organizations should prioritize deploying the official Apple patches: iOS 18.7.5, iPadOS 18.7.5, and corresponding updates for other Apple platforms. Beyond patching, organizations should implement strict policies controlling the use of external HID devices, including USB keyboards, mice, and other peripherals, especially in sensitive or high-security environments. Employ device management solutions to whitelist approved peripherals and block unknown or untrusted devices. Educate users about the risks of connecting unverified HID devices and encourage vigilance regarding physical device security. Network segmentation and endpoint protection can help detect anomalous device connections or behavior. Monitoring logs for unusual process crashes may provide early indicators of attempted exploitation. For high-security deployments, consider disabling or restricting HID interfaces where feasible. Regularly review and update security policies to incorporate lessons learned from this vulnerability.