Apple Update Mitigates “Extremely Sophisticated” Zero

Apple patched an input validation flaw (CVE-2023-41061, CWE-20) in the Wallet component of iOS, iPadOS, and watchOS that can allow arbitrary code execution when a user interacts with a maliciously crafted attachment. The attack is local and requires user interaction (CVSS 7.8, AV:L/UI:R), so the victim must open or act on the crafted attachment — typically delivered through messaging or another application — for the exploit to succeed. A successful attack yields code execution on the device, and media reports describe it as having been used in 'extremely sophisticated attacks' chained with other Apple zero-days. Anyone running iPhone OS (iOS), iPadOS, or watchOS versions prior to iOS/iPadOS 16.6.1 and watchOS 9.6.2 is affected, a population on the order of a billion active devices. Apple disclosed the issue as actively exploited, and CISA added it to the Known Exploited Vulnerabilities (KEV) catalog on 2023-09-11.

Do: Immediately update iPhones and iPads to iOS/iPadOS 16.6.1 or later, and Apple Watch to watchOS 9.6.2 or later. Because the flaw is listed in CISA's KEV catalog and was actively exploited at disclosure, treat patching as urgent for all user fleets, especially high-value targets; until patched, exercise caution with attachments from untrusted sources. No public proof-of-concept is known, but defenders should check fleet OS versions for stragglers on pre-16.6.1 builds.

CVE-2023-41064 is a buffer overflow (CWE-120) in the ImageIO component of Apple iOS, iPadOS, and macOS that is triggered when the system processes a maliciously crafted image. Because ImageIO performs image decoding for messaging and web content, an attacker can reach the flaw through attachments or web pages, and successful exploitation may allow arbitrary code execution on the device. The flaw was exploited in the wild as part of a chain with CVE-2023-41061 (WebKit), which public reporting described as a zero-click, spyware-grade compromise chain used against civil-society targets. All users of iPhones, iPads, and Macs running builds released before Apple's September 2023 fixes are affected, making the exposed population extremely large. The vulnerability was added to the CISA KEV catalog on 2023-09-11, carries a high EPSS score of 45.1% (99th percentile), and no standalone public proof-of-concept is known because exploitation is occurring in real-world attacks rather than labs.

Do: Apply Apple's September 2023 fixes — iOS and iPadOS 16.6.1 or later and macOS Ventura 13.5.2 or later — across all iPhone, iPad, and Mac fleets, which satisfies the CISA KEV required action. Because the observed in-the-wild chain paired this ImageIO bug with the CVE-2023-41061 WebKit flaw, treat unpatched devices as actively targeted and prioritize high-value users and privileged endpoints. If updates cannot be deployed promptly, follow the KEV guidance to apply vendor mitigations or discontinue use of the affected devices.

Apple's WebKit engine, which renders web content for Safari and for essentially all HTML processing on iOS, iPadOS, and macOS, contains a flaw that leads to code execution when processing maliciously crafted web content. It is triggered when a user's browser or embedded web view loads attacker-controlled web content, so simply visiting a hostile page can be enough. Successful exploitation could allow arbitrary code execution within the affected application's context, a common stepping stone to broader device compromise. All users of Apple iOS, iPadOS, macOS, and Safari are potentially affected, as are users of non-Apple products that rely on WebKit for HTML processing. The flaw was added to CISA's Known Exploited Vulnerabilities catalog on 2023-09-25, indicating confirmed in-the-wild exploitation; no public proof-of-concept is known.

Do: Apply Apple's latest security updates for iOS, iPadOS, macOS, and Safari that patch WebKit, following the vendor instructions referenced by the CISA KEV entry, and treat unpatched WebKit builds as actively exploited. Until systems are patched, restrict exposure to untrusted web content (e.g., limit browsing and in-app web views to trusted sites for high-risk users). Also inventory any non-Apple applications or HTML-processing components in your environment that bundle WebKit and update them as their maintainers ship fixes.

CVE-2025-24200 is an incorrect authorization flaw (CWE-863) in Apple iOS and iPadOS, caused by an authorization issue in state management that Apple resolved with improved state handling. An attacker with brief physical access to a locked device can exploit the flaw to disable USB Restricted Mode, the feature that locks down a locked iPhone or iPad's USB data port against accessories after a set period. This allows USB accessories, including data-extraction and attack peripherals, to communicate with the device while it remains locked, with a high confidentiality and integrity impact (CVSS 6.1, physical attack vector). Any iPhone or iPad user running a version prior to the applicable fixed release is affected, with fixes shipped in iOS 15.8.4, iOS 16.7.11, iOS 18.3.1, iPadOS 15.8.4, iPadOS 16.7.11, iPadOS 17.7.5, and iPadOS 18.3.1. Apple reports the flaw may have been exploited in an extremely sophisticated attack against specific targeted individuals, and CISA added it to the Known Exploited Vulnerabilities catalog on 2025-02-12.

Do: Update iPhones to iOS 15.8.4, iOS 16.7.11, or iOS 18.3.1 and iPads to iPadOS 15.8.4, 16.7.11, 17.7.5, or 18.3.1 as applicable to each device's branch, checking Settings > General > Software Update for unmanaged devices. Because exploitation requires physical access, prioritize high-risk users (executives, journalists, government personnel), confirm no fleet devices remain on unpatched builds, and avoid untrusted USB accessories and charging ports until updated. CISA's KEV listing requires federal agencies to apply the vendor patch per the required action or discontinue use of the product.