CVE-2024-40780 is a vulnerability identified in Apple Safari and related Apple operating systems that stems from an out-of-bounds read condition (CWE-125). This occurs when Safari processes specially crafted web content that does not properly enforce bounds checking, allowing the browser to read memory outside the intended buffer. While this flaw does not compromise confidentiality or integrity, it can cause the Safari process to crash unexpectedly, resulting in a denial-of-service (DoS) condition. The vulnerability affects multiple Apple platforms including iOS (16.7.9 and 17.6), iPadOS (16.7.9 and 17.6), macOS Sonoma 14.6, watchOS 10.6, tvOS 17.6, and visionOS 1.3. The CVSS v3.1 base score of 6.5 reflects a medium severity, with an attack vector of network (remote attacker), low attack complexity, no privileges required, but requiring user interaction (visiting a malicious web page). The scope is unchanged, meaning the impact is limited to the vulnerable component (Safari process). No known exploits have been reported in the wild, but the potential for denial-of-service attacks exists if an attacker entices users to visit maliciously crafted web pages. The vulnerability was addressed by Apple through improved bounds checking in the affected components. This type of vulnerability is significant because it can be used to disrupt user access to web services or cause instability in critical applications relying on Safari or embedded WebKit components.

For European organizations, the primary impact of CVE-2024-40780 is availability disruption due to potential denial-of-service conditions when Safari crashes unexpectedly. This can affect end-user productivity, especially in environments heavily reliant on Apple devices for web access and business operations. Organizations in sectors such as finance, healthcare, government, and critical infrastructure that use Safari as a primary browser may experience interruptions in accessing web-based applications or services. Although the vulnerability does not lead to data breaches or unauthorized code execution, repeated crashes could be exploited to degrade service reliability or as part of a broader attack chain. Additionally, organizations with Bring Your Own Device (BYOD) policies may face indirect risks if employee devices are compromised or unstable. The lack of known exploits in the wild reduces immediate risk, but the medium severity rating and ease of triggering the crash through crafted web content warrant prompt attention to patching and user awareness.

1. Apply the latest Apple security updates immediately: Ensure all Apple devices, including iPhones, iPads, Macs, Apple Watches, Apple TVs, and visionOS devices, are updated to the patched versions (iOS 16.7.9 or later, Safari 17.6 or later, macOS Sonoma 14.6 or later, etc.). 2. Enforce enterprise mobile device management (MDM) policies to automate patch deployment and compliance monitoring. 3. Educate users about the risks of visiting untrusted or suspicious websites and encourage cautious browsing behavior. 4. Use network security controls such as web filtering and DNS filtering to block access to known malicious domains or suspicious web content. 5. Monitor Safari crash logs and endpoint telemetry for unusual patterns that may indicate exploitation attempts or instability. 6. For critical environments, consider restricting Safari usage or deploying alternative browsers until patches are applied. 7. Regularly review and update incident response plans to include scenarios involving browser-based denial-of-service conditions. 8. Collaborate with Apple support channels for guidance on patch rollout and vulnerability management.