CVE-2023-42873 is a vulnerability identified in Apple iOS, iPadOS, and macOS operating systems that allows a local application to execute arbitrary code with kernel privileges. The root cause is an out-of-bounds write (CWE-787) due to insufficient bounds checking in the kernel code. This flaw enables an attacker with limited privileges on the device to escalate their privileges to kernel level, effectively gaining full control over the system. The vulnerability does not require user interaction but does require that the attacker has the ability to run a local app, which could be achieved through malicious app installation or exploitation of other vulnerabilities. Apple addressed this issue by improving bounds checks in the kernel and released patches across multiple OS versions: iOS 16.7.2, iOS 17.1, iPadOS 16.7.2, iPadOS 17.1, macOS Sonoma 14.1, macOS Monterey 12.7.1, and macOS Ventura 13.6.1. The CVSS v3.1 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability, with low attack vector complexity but requiring local privileges. No public exploits are known at this time, but the vulnerability’s nature makes it a critical risk if exploited, as it could allow attackers to bypass security controls, install persistent malware, or steal sensitive data. The vulnerability affects a broad range of Apple devices, including iPhones, iPads, and Macs, making it relevant for both consumer and enterprise environments.

For European organizations, the impact of CVE-2023-42873 is significant due to the widespread use of Apple devices in business and government sectors. Successful exploitation could lead to complete system compromise, allowing attackers to access sensitive corporate data, intellectual property, or personal information protected under GDPR. The ability to execute code with kernel privileges means attackers could disable security mechanisms, install persistent backdoors, or manipulate system operations undetected. This poses a direct threat to confidentiality, integrity, and availability of critical systems. Sectors such as finance, healthcare, government, and telecommunications, which rely heavily on Apple devices for secure communications and operations, are particularly vulnerable. Additionally, the vulnerability could be leveraged in targeted attacks or espionage campaigns against high-value European targets. The absence of known exploits currently provides a window for mitigation, but the risk remains high given the potential impact and ease of local exploitation once a malicious app is present.

European organizations should prioritize immediate patching of all affected Apple devices by deploying the updates iOS 16.7.2, iOS 17.1, iPadOS 16.7.2, iPadOS 17.1, macOS Sonoma 14.1, macOS Monterey 12.7.1, and macOS Ventura 13.6.1. Restricting app installations to trusted sources such as the Apple App Store and enforcing strict mobile device management (MDM) policies can reduce the risk of malicious app deployment. Implementing application whitelisting and monitoring for unusual kernel-level activity can help detect exploitation attempts. Organizations should also educate users about the risks of installing untrusted applications and enforce least privilege principles to limit local user permissions. Regularly auditing device compliance and using endpoint detection and response (EDR) tools tailored for Apple platforms will enhance visibility into potential exploitation. For high-risk environments, consider isolating critical Apple devices from less secure networks and applying network segmentation to limit lateral movement in case of compromise.