CVE-2025-43359: 
macOS vulnerability analysis and mitigation

CVE-2025-43359 is a kernel-level vulnerability discovered in Apple's operating systems that was disclosed and patched on September 15, 2025. The vulnerability affects multiple Apple platforms including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. It was discovered by security researcher Viktor Oreshkin and involves a logic issue in the kernel's handling of UDP server sockets (Apple Support, NVD).

The vulnerability is characterized as a logic issue where a UDP server socket bound to a local interface may incorrectly become bound to all interfaces. The issue was addressed by Apple through improved state management in the kernel. The vulnerability has received a CVSS 3.1 Base Score of 9.8 (CRITICAL) with a vector string of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating high severity with potential for remote exploitation (CISA-ADP).

The vulnerability could potentially allow unauthorized access across all network interfaces when a UDP server socket is intended to be bound only to a local interface. This could lead to exposure of services intended to be accessible only locally, potentially compromising system security and network isolation (Apple Support).

Apple has released security updates addressing this vulnerability across their product line. The fix is included in iOS 26 and iPadOS 26, tvOS 26, macOS Sonoma 14.8, macOS Sequoia 15.7, iOS 18.7 and iPadOS 18.7, visionOS 26, watchOS 26, and macOS Tahoe 26. Users are advised to update their devices to these latest versions to protect against potential exploitation (Apple Support).