CVE-2022-22620: Apple iOS, iPadOS, and macOS Webkit Use-After-Free Vulnerability

CVE-2022-22620 is a use-after-free vulnerability in WebKit on Apple iOS, iPadOS, and macOS. Processing maliciously crafted web content can lead to code execution. It matters because WebKit powers Safari and other HTML parsers, so the flaw can affect Apple browsers and non-Apple products that rely on WebKit for HTML processing. Defenders should treat it as a high-priority browser and rendering-engine risk and confirm all details against the vendor advisory.

How it works

The weakness is CWE-416, use-after-free. In this class of flaw, memory is freed while a pointer to it remains, and later use of that dangling pointer can corrupt memory or allow an attacker to influence execution. Per the CISA summary, Apple iOS, iPadOS, and macOS WebKit contain this use-after-free that leads to code execution when processing maliciously crafted web content. An attacker would typically lure a user to open or render such content in a WebKit-based component. Exact exploit mechanics and any preconditions are not detailed here; confirm against the vendor advisory. The issue can extend beyond Safari to other HTML parsers that embed WebKit.

Am I affected? How to find it in your systems

Affected platforms are Apple iOS, iPadOS, and macOS systems that include the vulnerable WebKit component. WebKit commonly appears in Safari and in other applications or frameworks that parse or render HTML. Inventory Apple devices under management, note OS and browser versions, and identify any third-party software that bundles or links WebKit for HTML processing. Check configuration and version information against the vendor advisory to determine whether a given build is patched. Because the trigger is malicious web content, review web proxy, DNS, and endpoint telemetry for unusual browser or WebKit process behavior, crashes tied to content rendering, or unexpected outbound connections after browsing. Public detail on specific indicators is limited; align detection with vendor and CISA guidance.

• Enumerate iOS, iPadOS, and macOS endpoints and their Safari/WebKit-related components.
• Identify non-Apple products in your environment that rely on WebKit for HTML parsing.
• Compare installed versions and builds to the fixed releases listed in the vendor advisory.
• Monitor for anomalous WebKit or browser process activity associated with untrusted content.

How to remediate

Patch first. Apply updates per vendor instructions, as required by CISA. Install the security updates Apple released for iOS, iPadOS, and macOS that address this WebKit use-after-free; confirm the exact update names and build numbers in the official advisory. After patching, verify that WebKit-dependent applications are also updated or rebuilt against the fixed engine where applicable. For this vulnerability class, reduce exposure by keeping browsers and OS images current, limiting untrusted web content on high-value systems, and enforcing least privilege so that a compromised renderer has minimal impact. Re-inventory after deployment to confirm coverage across mobile and desktop fleets.

If you can't patch immediately

Until updates can be applied, reduce risk with compensating controls. Segment devices that must browse untrusted content from sensitive networks. Where feasible, use virtual patching or WAF/proxy rules that block or sandbox known malicious content patterns, understanding that these are incomplete substitutes for the vendor fix. Disable or restrict nonessential WebKit-based features or secondary browsers if policy allows. Increase monitoring of web content rendering, process crashes, and post-browse network activity, and enforce stricter content filtering and attachment/link handling for users on unpatched systems. Prioritize rapid patch windows; compensating controls do not eliminate the code-execution risk from crafted web content.

• Network segmentation and restricted browsing for unpatched Apple devices.
• Content filtering, proxy inspection, and heightened logging around WebKit processes.
• Temporary disablement of optional HTML-rendering features that depend on the vulnerable component.
• Accelerated change control to deploy the vendor updates as soon as possible.

If your data may have been exposed

Actively exploited vulnerabilities can lead to device compromise and data exposure even when ransomware use is not documented for this CVE. If you suspect successful exploitation, isolate affected systems, preserve logs, credential-reset where appropriate, and follow your incident response process. You can run a free exposure scan of your email to check known breach data and determine whether addresses tied to your environment appear in prior breaches.