CVE-2023-28205

CVE-2023-28205 is a use-after-free flaw (CWE-416) in the WebKit engine shipped with Apple iOS, iPadOS, macOS, and the Safari browser, where memory is freed and then incorrectly reused while processing HTML. It is triggered when a device processes maliciously crafted web content, meaning simply loading an attacker-controlled page in Safari or any WebKit-based HTML renderer can trigger the bug. Successful exploitation allows the attacker to achieve code execution in the context of the WebKit process on the victim device. All users of iOS, iPadOS, macOS, and Safari are potentially affected, as are non-Apple products that rely on WebKit for HTML processing. The flaw is being actively exploited in the wild — it was added to CISA's Known Exploited Vulnerabilities catalog on 2023-04-10, with the required action to apply updates per vendor instructions — and EPSS assigns a 27.1% probability of exploitation within 30 days (98th percentile).

What to do: Apply Apple's current security updates for iOS, iPadOS, macOS, and Safari as soon as possible, per the vendor instructions cited in the CISA KEV listing. Because this is a browser/HTML-engine flaw exploited in the wild, prioritize patching internet-facing and high-risk user fleets; users of non-Apple WebKit-based HTML parsers should check with their software vendors for updated WebKit components. Until patched, exercise caution with untrusted web content.