CVE-2025-43384 is an out-of-bounds access vulnerability in Apple iOS and iPadOS that occurs when processing specially crafted media files. The root cause is inadequate bounds checking during media file processing, which can lead to unexpected application termination or corruption of process memory. This vulnerability is classified under CWE-125 (Out-of-bounds Read). Exploitation requires no privileges but does require user interaction, specifically opening or processing a malicious media file. The vulnerability affects multiple Apple operating systems including iOS, iPadOS, macOS Sequoia and Tahoe, tvOS, and visionOS, with patches released in versions iOS 18.7.2, iPadOS 18.7.2, macOS Sequoia 15.7.2, macOS Tahoe 26.1, tvOS 26.1, and visionOS 26.1. The CVSS v3.1 base score is 4.3, indicating medium severity, with attack vector as network, low attack complexity, no privileges required, user interaction required, and impact limited to availability (app termination or memory corruption). There are no known exploits in the wild at this time. The vulnerability could be leveraged to cause denial-of-service conditions or potentially facilitate further memory corruption attacks if combined with other vulnerabilities. The fix involves improved bounds checking to prevent out-of-bounds memory access during media file processing.

The primary impact of CVE-2025-43384 is denial-of-service through unexpected app termination, which can disrupt user experience and potentially critical applications on iOS and iPadOS devices. Memory corruption could also lead to unpredictable behavior or crashes, possibly opening avenues for further exploitation such as privilege escalation or code execution if chained with other vulnerabilities, although no such exploits are currently known. Organizations relying heavily on Apple mobile devices for business operations, especially those processing untrusted media content, may face operational disruptions. The vulnerability could affect enterprise environments, government agencies, and individuals, particularly where media files are shared or downloaded from untrusted sources. The scope includes a wide range of Apple devices running the affected OS versions, making the potential impact broad. However, the requirement for user interaction and lack of direct confidentiality or integrity impact limits the severity to medium. Nonetheless, disruption of critical apps or services could have cascading effects in sensitive environments.

To mitigate CVE-2025-43384, organizations and users should promptly apply the security updates released by Apple for iOS 18.7.2, iPadOS 18.7.2, and other affected OS versions. Beyond patching, organizations should implement strict controls on media file sources, including filtering and scanning media files before distribution or opening. Employ mobile device management (MDM) solutions to enforce update policies and restrict installation of untrusted applications or media. Educate users about the risks of opening media files from unknown or untrusted sources to reduce the likelihood of triggering the vulnerability. Monitor application logs and device behavior for signs of unexpected app crashes or memory corruption that could indicate exploitation attempts. For high-security environments, consider disabling automatic media processing features or sandboxing media handling components to limit potential damage. Maintain an incident response plan that includes steps for handling suspected exploitation of media processing vulnerabilities.