CVE-2025-43377 is a vulnerability classified as an out-of-bounds read (CWE-125) in Apple’s iOS and iPadOS operating systems, as well as in macOS Sequoia and Tahoe versions. The root cause is insufficient bounds checking in a component accessible to local applications, which allows a malicious or buggy app with limited privileges to read memory outside the intended buffer boundaries. This memory access flaw can cause the affected system to crash or become unresponsive, resulting in a denial-of-service (DoS) condition. The vulnerability does not allow for privilege escalation, data leakage, or code execution, but it impacts system availability. Exploitation requires the attacker to have local access with limited privileges (AV:L) and does not require user interaction (UI:N). The vulnerability was addressed by Apple in updates iOS 18.7.2, iPadOS 18.7.2, macOS Sequoia 15.7.2, and macOS Tahoe 26.1 through improved bounds checking to prevent out-of-bounds reads. No public exploits or active exploitation have been reported to date. The CVSS v3.1 base score is 5.5, reflecting a medium severity level due to the limited impact on confidentiality and integrity but high impact on availability. This vulnerability highlights the importance of rigorous input validation and memory safety in operating system components that handle app data.

The primary impact of CVE-2025-43377 is denial-of-service, where affected Apple devices may crash or become unresponsive due to an out-of-bounds read triggered by a local app. This can disrupt business operations, especially in environments relying heavily on iOS and iPadOS devices for critical communications, workflows, or customer-facing applications. Although the vulnerability does not compromise data confidentiality or integrity, repeated or targeted exploitation could degrade user productivity and trust in device reliability. Organizations with large Apple device deployments, such as enterprises, educational institutions, and government agencies, may face operational interruptions. Additionally, service providers offering managed Apple device environments could experience increased support costs and reputational damage if devices are affected. The lack of known exploits reduces immediate risk, but the medium severity and ease of local exploitation warrant prompt patching to avoid potential future abuse.

To mitigate CVE-2025-43377, organizations should prioritize updating all affected Apple devices to iOS 18.7.2, iPadOS 18.7.2, macOS Sequoia 15.7.2, or macOS Tahoe 26.1 as soon as possible. Beyond patching, organizations should enforce strict app vetting and installation policies to minimize the risk of malicious or buggy apps triggering the vulnerability. Employ Mobile Device Management (MDM) solutions to control app permissions and restrict installation of untrusted applications. Monitor device stability and logs for signs of crashes or abnormal behavior that could indicate exploitation attempts. Educate users about the risks of installing apps from unverified sources. For high-security environments, consider implementing application sandboxing and runtime protections to further limit the impact of local app vulnerabilities. Regularly review and update security policies to incorporate lessons learned from such vulnerabilities.