CVE-2025-43533 is a vulnerability identified in Apple’s iOS and iPadOS platforms, as well as other Apple operating systems, where a malicious Human Interface Device (HID) can trigger an unexpected process crash. The root cause is insufficient bounds checking (CWE-20) when processing input from HID devices, which can be exploited by an attacker controlling or emulating a malicious HID device. This flaw can lead to denial of service (DoS) by crashing critical processes, impacting system availability. The vulnerability requires user interaction, specifically connecting or interacting with the malicious HID device, and does not require prior authentication. The CVSS v3.1 base score is 5.7 (medium severity), reflecting the attack vector as adjacent network (AV:A), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), unchanged scope (S:U), and impact limited to availability (A:H) without affecting confidentiality or integrity. Apple has released patches in iOS 18.7.5, iPadOS 18.7.5, and corresponding updates for macOS Sequoia, Sonoma, Tahoe, tvOS, visionOS, and watchOS to address this issue by improving bounds checks. No public exploits or active exploitation have been reported to date. The vulnerability highlights risks associated with peripheral device input validation and the importance of robust input handling in OS kernels and drivers.

The primary impact of CVE-2025-43533 is denial of service, where affected Apple devices may experience unexpected process crashes when interacting with malicious HID devices. This can disrupt normal operations, potentially causing system instability or requiring device reboots. For organizations relying heavily on Apple ecosystems, such disruptions could affect productivity, especially in environments where HID devices like keyboards, mice, or specialized input devices are common. Although the vulnerability does not allow data theft or privilege escalation, repeated or targeted exploitation could be used to degrade service availability or cause interruptions in critical workflows. Industries such as finance, healthcare, government, and technology sectors that use Apple devices extensively could face operational risks. The requirement for user interaction and physical or logical access to connect a malicious HID device somewhat limits remote exploitation but does not eliminate risk in scenarios involving insider threats or compromised peripherals.

Organizations should prioritize applying the security updates released by Apple for iOS 18.7.5, iPadOS 18.7.5, and the related OS versions on macOS, tvOS, visionOS, and watchOS to remediate this vulnerability. Beyond patching, organizations should implement strict controls on peripheral device usage, including: enforcing policies that restrict the use of unauthorized or untrusted HID devices; employing endpoint security solutions capable of detecting anomalous HID behavior; educating users about the risks of connecting unknown USB or Bluetooth input devices; and using device management tools to whitelist approved peripherals. Network segmentation and physical security controls can reduce the risk of malicious device insertion. Monitoring system logs for unusual process crashes or HID-related errors can help detect attempted exploitation. For high-security environments, consider disabling unused HID interfaces or using hardware-based USB device authentication solutions.