CVE-2024-40806 is a vulnerability classified as an out-of-bounds read (CWE-125) affecting Apple’s iOS, iPadOS, macOS, tvOS, visionOS, and watchOS operating systems. The root cause is insufficient input validation when processing certain file types, which allows an attacker to craft a malicious file that triggers reading memory outside the intended buffer boundaries. This memory access violation leads to unexpected application termination, effectively causing a denial-of-service (DoS) condition. The vulnerability does not allow for code execution, privilege escalation, or data leakage, but it disrupts normal app functionality. The flaw requires user interaction, as the victim must open or process the malicious file locally. No privileges or authentication are required, but the attack vector is local (AV:L), meaning the attacker must have access to the device or convince the user to open the file. Apple has released patches addressing this vulnerability in iOS 16.7.9, iPadOS 16.7.9, iOS 17.6, iPadOS 17.6, macOS Monterey 12.7.6, macOS Sonoma 14.6, macOS Ventura 13.6.8, tvOS 17.6, visionOS 1.3, and watchOS 10.6. There are no known exploits in the wild at the time of publication. The CVSS v3.1 base score is 5.5, reflecting medium severity due to the limited impact scope and exploitation complexity. This vulnerability primarily affects environments where users handle files from untrusted sources, such as email attachments, downloads, or shared media. The fix involves improved input validation to prevent out-of-bounds memory reads during file processing.

The primary impact of CVE-2024-40806 is denial of service through unexpected termination of applications processing maliciously crafted files. This can disrupt user productivity and potentially impact business operations if critical applications crash repeatedly. Since the vulnerability does not compromise confidentiality or integrity, data theft or manipulation is not a concern. However, frequent app crashes could lead to user frustration, loss of trust, and operational delays, especially in sectors relying heavily on Apple devices for communication, document handling, or media processing. In enterprise or government environments, this could affect workflows and incident response capabilities. The requirement for user interaction and local access limits the attack surface but does not eliminate risk, particularly in scenarios involving social engineering or insider threats. Organizations that do not promptly apply patches may face increased risk of disruption, especially if attackers develop exploit code in the future. The vulnerability’s presence across multiple Apple platforms broadens the potential impact footprint.

To mitigate CVE-2024-40806, organizations should prioritize deploying the official Apple security updates that address this vulnerability: iOS/iPadOS 16.7.9 and 17.6, macOS Monterey 12.7.6, Sonoma 14.6, Ventura 13.6.8, tvOS 17.6, visionOS 1.3, and watchOS 10.6. Beyond patching, organizations should implement strict file handling policies, including restricting or scanning files from untrusted sources before opening them on Apple devices. Employ endpoint protection solutions capable of detecting anomalous app crashes or suspicious file activity. Educate users about the risks of opening unsolicited or unexpected files, emphasizing caution with email attachments and downloads. Use mobile device management (MDM) tools to enforce update compliance and monitor device health. Consider application whitelisting or sandboxing to limit the impact of app crashes. Regularly review logs for unusual app termination events that may indicate exploitation attempts. For high-security environments, restrict local file transfers and use secure file sharing platforms that scan for malicious content. These layered defenses reduce the likelihood of successful exploitation and minimize operational disruption.