CVE-2025-43349 is an out-of-bounds write vulnerability classified under CWE-787 that affects Apple macOS and related operating systems such as tvOS, watchOS, iOS, iPadOS, and visionOS. The root cause is insufficient input validation when processing specially crafted video files, which can lead to memory corruption resulting in unexpected application termination. This vulnerability does not allow for code execution or data leakage but impacts application availability by causing crashes. The flaw requires local access with limited privileges and user interaction to trigger, as a user must open or process the malicious video file. Apple has released patches in multiple OS versions including macOS Sonoma 14.8 and macOS Sequoia 15.7 to address this issue by improving input validation routines. The CVSS v3.1 base score is 2.8, reflecting low severity due to the limited impact on confidentiality and integrity and the requirement for user interaction and local privileges. No public exploits or active exploitation have been reported, indicating a low likelihood of widespread attack. However, the vulnerability could be leveraged for denial-of-service attacks against applications handling video content, potentially disrupting user workflows or services relying on media processing.

The primary impact of CVE-2025-43349 is on the availability of applications processing video files on affected Apple operating systems. Unexpected application termination can disrupt user activities, cause loss of unsaved data, and potentially degrade service reliability in environments relying on media processing. Since the vulnerability does not affect confidentiality or integrity, there is no direct risk of data breach or unauthorized modification. The requirement for local privileges and user interaction limits remote exploitation and large-scale automated attacks. However, targeted denial-of-service attacks could be conducted by tricking users into opening malicious video files, which may be particularly disruptive in enterprise environments where media applications are critical. Organizations with workflows involving video content on Apple devices may experience operational interruptions. The absence of known exploits reduces immediate risk, but unpatched systems remain vulnerable to potential future attacks.

To mitigate CVE-2025-43349, organizations and users should promptly apply the security updates released by Apple for macOS Sonoma 14.8, macOS Sequoia 15.7, and other affected OS versions including tvOS 26, watchOS 26, iOS 26, iPadOS 26, visionOS 26, iOS 18.7, and iPadOS 18.7. Beyond patching, organizations should implement strict controls on the handling and sharing of video files, especially from untrusted sources, to reduce the risk of user interaction with malicious content. Employ endpoint protection solutions capable of detecting anomalous application crashes or suspicious media files. Educate users about the risks of opening unsolicited or suspicious video files and encourage verification of file sources. For environments with critical media processing needs, consider sandboxing or isolating applications that handle video content to limit the impact of potential crashes. Regularly monitor application logs and system stability to detect unusual termination patterns that may indicate exploitation attempts. Maintain up-to-date backups to mitigate data loss from unexpected application failures.