CVE-2023-37450: Apple Multiple Products WebKit Code Execution Vulnerability

CVE-2023-37450 is a code-execution vulnerability in WebKit, the engine used by Apple Safari and other HTML parsers. It affects Apple iOS, iPadOS, macOS, and Safari, and can also impact non-Apple products that rely on WebKit for processing web content. When a device processes maliciously crafted web content, an attacker may achieve code execution. This matters because successful exploitation can give an attacker control over the affected process or device, potentially leading to further compromise of user data or systems. Confirm exact impact and scope against the vendor advisory.

CISA directs organizations to apply updates per vendor instructions or discontinue use of the product if updates are unavailable. Known ransomware use is not documented for this CVE.

How it works

The weakness is an unspecified vulnerability in WebKit that results in code execution when the engine processes maliciously crafted web content. WebKit is responsible for parsing and rendering HTML, CSS, JavaScript, and related web resources. An attacker who can deliver such content—typically via a web page or embedded web view—can trigger the flaw during normal content processing.

Because the CWE is not specified in the available record, defenders should treat this as a classic browser/engine memory-safety or parsing issue that allows arbitrary code to run in the context of the WebKit process. The same risk extends to any application that embeds WebKit for HTML handling. Exact exploit mechanics are not detailed publicly in the provided facts; always verify technical details against Apple’s advisory rather than assuming a particular trigger or privilege level.

Am I affected? How to find it in your systems

This vulnerability affects Apple iOS, iPadOS, macOS, and Safari, plus any non-Apple products that use WebKit for HTML processing. Typical locations include:

• Apple-managed endpoints: iPhones, iPads, Macs running Safari or other WebKit-based components.
• Enterprise fleets that include Apple devices or applications embedding WebKit (for example, certain cross-platform browsers, email clients, or custom apps that render web content).
• Any HTML parser or web-view library that ships WebKit rather than a different engine.

Inventory steps:

• Use MDM, Apple Business Manager, or endpoint management tools to list all iOS, iPadOS, and macOS devices and their OS/Safari versions.
• Query software inventories for applications that declare WebKit or WebKitGTK dependencies.
• On macOS, check Safari version and system WebKit frameworks; on mobile, confirm the installed OS build.

Because exact affected version ranges are not provided here, compare every discovered version against the current Apple security advisory. Log or telemetry signs of exploitation are not detailed in the facts; look for unexpected process crashes in WebKit/Safari, anomalous network connections originating from browser processes, or sudden privilege escalations following web browsing. Correlate with web-proxy or DNS logs for visits to untrusted sites around the time of any suspicious activity.

How to remediate

Patch first. Apply the updates released by Apple for iOS, iPadOS, macOS, and Safari exactly as described in the vendor advisory. For non-Apple products that embed WebKit, obtain and install the corresponding vendor-supplied updates that incorporate the fixed WebKit code. If no update is available for a given product, CISA guidance is to discontinue use of that product.

After patching, harden the environment for this class of browser-engine flaws:

• Keep all Apple devices and WebKit-dependent applications on supported, regularly updated releases.
• Enforce least-privilege browsing where possible (for example, separate user accounts or managed browser profiles).
• Disable or restrict unnecessary web-content features and plugins that increase the attack surface of HTML parsers.
• Ensure automatic update mechanisms are enabled and monitored for success.

Re-inventory after remediation to confirm every instance has received the vendor update.

If you can't patch immediately

Until the vendor update can be applied, reduce exposure with compensating controls:

• Network segmentation: isolate Apple devices and WebKit-using systems from high-value assets; limit outbound web access to known-good destinations via proxy or DNS filtering.
• Virtual patching / WAF: if web content is proxied, deploy rules that block or sanitize known malicious patterns associated with WebKit exploits (confirm signatures against current threat intelligence).
• Feature disablement: turn off or restrict Safari and other WebKit web views where operationally feasible; prefer alternative browsers or rendering engines that do not share the vulnerable component.
• Monitoring: increase logging of browser process activity, crash reports, and unusual child-process creation; alert on anomalous behavior following web navigation.
• User guidance: instruct users to avoid untrusted links and attachments until systems are patched.

If updates remain unavailable indefinitely, plan to discontinue use of the affected product as directed by CISA.

If your data may have been exposed

Code-execution vulnerabilities in web engines can lead to device compromise and subsequent data exposure. Known ransomware use is not documented for CVE-2023-37450. If you suspect exploitation, isolate the device, preserve forensic evidence, and follow your incident-response plan. You can run a free exposure scan of your email addresses against known breach data sets to check whether credentials or personal information have already appeared in public breach collections.