CVE-2019-8605

What Is Affected?

This vulnerability affects the shared codebase across iOS, macOS, tvOS, and watchOS, in a component that can be reached by an installed application running with limited privileges.

Overview

CVE-2019-8605 is a use-after-free vulnerability (CWE-416) that lets a malicious application achieve code execution with system privileges, escalating well beyond its sandboxed permissions. It is rated high severity (CVSS 7.8) and requires that a user first install or run the malicious application.

Technical Details

The flaw is a classic use-after-free: a reference to previously freed memory is reused, giving an attacker who can influence what fills that memory region a way to corrupt program state and redirect execution. Combined with an app already running on the device (installed via sideloading, enterprise-provisioning abuse, or a compromised app-store submission), this can escalate a sandboxed app's privileges to full system control.

Discovery

Patched by Apple in its December 2019 security update round across iOS, macOS, tvOS, and watchOS.

Exploitation Context

CISA added this CVE to the KEV catalog in June 2022, confirming real-world exploitation. This bug class — privilege escalation from a malicious or compromised app to system privileges — is a common second stage in mobile spyware and malware campaigns, used after an app manages to get installed on a target device through social engineering or supply-chain abuse.

Remediation

1. Update all affected Apple devices to the latest supported OS versions.
2. Only install applications from the official App Store, and review app permissions carefully.
3. Enterprises should tightly control mobile device management (MDM) enterprise app provisioning to prevent unauthorized app installation.
4. Enable Lockdown Mode for high-risk users.
5. Monitor managed fleets for outdated OS versions and enforce update compliance policies.