Apple operating systems EUVD-2026-29280

Requires network connectivity to the vulnerable Apple device - the target must be reachable on a network interface accessible to the attacker (corporate network, public Wi-Fi, or internet-exposed for devices with public IPs). No authentication is required (PR:N), meaning attackers need not compromise credentials or bypass security controls. No user interaction is necessary (UI:N), allowing fully remote exploitation. Exploitation is limited by the inherent difficulty of reliably winning race conditions over network latency, which may reduce success rates in high-latency or jittery network environments. The vulnerability affects default configurations across all listed Apple platforms, requiring no special features to be enabled. Attack surface is reduced on devices behind NAT or firewalls without port forwarding, and on networks with ingress filtering blocking the specific traffic patterns that trigger the race condition.

This presents a paradox between CVSS severity and real-world risk signals. The CVSS vector (AV:N/AC:L/PR:N/UI:N) indicates unauthenticated network exploitation with low complexity targeting availability (A:H), yielding a 7.5 score that typically warrants urgent attention. However, multiple signals suggest lower practical risk: EPSS exploitation probability is extremely low (0.02%, 7th percentile), indicating security researchers and threat actors have not prioritized this vulnerability. No CISA KEV listing confirms absence of observed active exploitation. The 'unexpected system termination' impact is denial-of-service only (C:N/I:N), not code execution, limiting attacker value. Race conditions (AC:L in CVSS notwithstanding) often require precise timing to exploit reliably over networks, making weaponization harder than the complexity score suggests. The attack is not automatable at scale due to timing dependencies inherent to race conditions. Technical impact is ambient (system-level DoS affecting all users), but exploitation status remains theoretical. Verdict: Medium-priority patching for enterprise environments - not an emergency despite the 7.5 score, but warrants inclusion in regular patch cycles given the network vector and Apple's ecosystem ubiquity. Consumer devices with automatic updates are adequately protected.

An unauthenticated attacker sends specially crafted network packets to a vulnerable Apple device (iPhone, Mac, Apple TV, or Apple Watch) accessible over the network. The malicious traffic triggers a race condition in a system service handling concurrent requests, causing threads to access shared memory in an unsafe order. The system detects an inconsistent state and terminates unexpectedly to prevent undefined behavior, resulting in device crash or service disruption. The attacker can repeat this attack to cause persistent denial of service, disrupting business operations or rendering the device temporarily unusable until reboot.