CVE-2020-27932: Apple Multiple Products Type Confusion Vulnerability

CVE-2020-27932 is a type confusion vulnerability affecting multiple Apple products—iOS, iPadOS, macOS, and watchOS. A malicious application may be able to execute code with kernel privileges, which can undermine the isolation between user-space apps and the operating system core. For IT and security teams, this matters because kernel-level code execution can enable full device compromise, persistence, and further lateral movement or data access on managed Apple fleets.

Public detail is limited to the CISA description and the associated weakness class. Confirm exact product builds, fixed releases, and any platform-specific notes directly against Apple’s vendor advisory before acting.

How it works

The flaw is classified as CWE-843 (Access of Resource Using Incompatible Type, commonly called type confusion). In this class of bug, code treats a resource or object as one type when it is actually another. That mismatch can corrupt memory layout assumptions, allow unintended pointer or object interpretation, and open a path to memory corruption.

According to the CISA summary, an attacker who can run a malicious application on a vulnerable device may abuse the type confusion to execute code with kernel privileges. No further exploit mechanics, trigger conditions, or proof-of-concept details are provided in the given facts; teams should treat any publicly circulating technical write-ups as unverified until cross-checked with the vendor advisory. The practical impact is privilege escalation from an app context into the kernel, which is a high-severity outcome for mobile and desktop endpoints alike.

Am I affected? How to find it in your systems

This vulnerability affects Apple iOS, iPadOS, macOS, and watchOS. These platforms typically appear as employee iPhones and iPads, Mac laptops and desktops (including those in BYOD or corporate-owned programs), and Apple Watch devices paired to managed phones.

Inventory steps:

• Use your MDM (Jamf, Intune, Mosyle, Kandji, or equivalent) to list enrolled devices and their OS version strings for iOS/iPadOS, macOS, and watchOS.
• For unmanaged or lightly managed Macs, query locally with system_profiler or sw_vers, or collect inventory via endpoint agents.
• Cross-reference collected version information against the fixed releases listed in Apple’s security advisory for CVE-2020-27932; do not assume version ranges from secondary sources.
• Pay particular attention to devices that allow sideloading, untrusted profiles, or installation of apps outside official distribution channels, as the attack path involves a malicious application.

Telemetry and log signs of exploitation are not detailed in the provided facts. In general for kernel privilege-escalation issues, look for unexpected kernel panics, sudden privilege or entitlement changes, unsigned or unusual kernel extensions (where still relevant), and anomalous process activity originating from user applications. Confirm any detection guidance in the vendor advisory or your EDR’s Apple-specific content.

How to remediate

Patch first. CISA’s required action is to apply updates per vendor instructions. Deploy the security updates Apple released for the affected products through your normal OS update or MDM channel as soon as you have validated them in a pilot group.

• Prioritize internet-facing or high-risk user devices, then broader fleet rollout.
• Verify post-update OS build numbers match the remediated versions in the advisory.
• For macOS, ensure automatic security updates are enabled where policy allows; for iOS/iPadOS/watchOS, enforce supervised update deadlines via MDM.

After patching, harden against the broader class: restrict installation of untrusted applications, enforce code-signing and notarization policies on macOS, limit the ability of standard users to install software, and keep kernel-extension / system-extension allow lists tight. Re-image or re-enroll devices only if you have concrete evidence of compromise; otherwise standard patching is the primary fix.

If you can't patch immediately

If immediate update is blocked by compatibility or change-control windows, reduce risk with compensating controls while you schedule the patch:

• Segment vulnerable devices onto restricted network zones with limited access to sensitive internal resources.
• Tighten application allow-listing and block installation of apps from unknown sources; on supervised iOS/iPadOS, use MDM restrictions to prevent untrusted profiles and app installs.
• Increase monitoring on those endpoints for anomalous app behavior, unexpected privilege use, and kernel-level anomalies via your EDR or Apple-unified logging pipelines.
• Virtual patching via network controls is of limited value against a local malicious-application path, but egress filtering and reducing the set of apps that can reach the device still help.
• Disable or remove non-essential apps and browser extensions that enlarge the local attack surface until the OS is updated.

These measures do not eliminate the vulnerability; they only lower the likelihood of successful abuse until the vendor update is applied.

If your data may have been exposed

Actively exploited vulnerabilities can lead to device compromise and subsequent data exposure, even when ransomware use is not documented for this CVE. If you suspect a malicious application ran on a vulnerable device before patching, follow your incident-response process: isolate the device, preserve logs, rotate credentials accessible from it, and assess what data the user or apps could reach. As a quick additional check, users and admins can run a free exposure scan of their email addresses against known breach datasets to see whether credentials or personal data have appeared in prior incidents.