CVE-2024-44165 is a logic flaw in Apple’s VPN implementation on iOS, iPadOS, and macOS platforms that causes network traffic to leak outside the intended VPN tunnel. VPNs are designed to encapsulate and encrypt all network traffic, ensuring confidentiality and integrity when communicating over untrusted networks. However, due to insufficient validation checks in the VPN logic, some traffic may bypass the VPN tunnel and be transmitted in cleartext over the underlying network interface. This leakage undermines the fundamental security guarantees of VPNs, exposing sensitive data such as credentials, private communications, or corporate information to interception by local network attackers or malicious actors on the same network segment. The vulnerability is remotely exploitable without requiring any privileges or user interaction, increasing the risk of exploitation. Apple has fixed this issue in recent OS releases, including iOS 17.7 and later, iPadOS 17.7 and later, and multiple macOS versions. The CVSS v3.1 base score is 7.5 (high), reflecting the ease of exploitation and the high impact on confidentiality. No integrity or availability impacts are noted. No public exploits or active exploitation campaigns have been reported to date, but the vulnerability poses a significant risk to users relying on Apple devices for secure VPN connectivity.

The primary impact of this vulnerability is the potential exposure of sensitive network traffic that was expected to be protected by the VPN tunnel. Organizations using Apple devices for remote work, secure communications, or accessing internal resources via VPN may experience confidentiality breaches if attackers intercept leaked traffic. This can lead to unauthorized disclosure of sensitive information, including corporate secrets, personally identifiable information (PII), authentication tokens, or other confidential data. The vulnerability does not affect data integrity or availability but compromises the trustworthiness of VPN protections. Industries with high security requirements such as finance, healthcare, government, and critical infrastructure are particularly at risk. Additionally, users on public or untrusted Wi-Fi networks are more vulnerable to interception attacks exploiting this flaw. The scope includes all affected Apple devices running vulnerable OS versions, which have significant global market penetration, increasing the potential scale of impact.

To mitigate this vulnerability, organizations and users should promptly update affected Apple devices to the patched OS versions: iOS 17.7 or later, iPadOS 17.7 or later, macOS Sequoia 15, Sonoma 14.7, Ventura 13.7, or visionOS 2. Until patches are applied, users should avoid connecting to untrusted or public networks when using VPNs on vulnerable devices. Network administrators can implement additional monitoring to detect anomalous traffic patterns that may indicate VPN leakage. Employing endpoint security solutions that monitor network interfaces for unexpected traffic can help identify exploitation attempts. Organizations should also consider multi-factor authentication and encryption at the application layer to protect sensitive data even if VPN protections fail. Regularly auditing VPN configurations and ensuring that split tunneling is disabled can reduce the risk of traffic leakage. Finally, educating users about the importance of timely updates and secure network practices is critical.