CVE-2025-43511 is a use-after-free vulnerability classified under CWE-416 that affects Apple Safari across multiple platforms including iOS, iPadOS, macOS Tahoe, visionOS, and watchOS. The vulnerability arises from improper memory management when processing specially crafted web content, which can lead to the Safari process unexpectedly crashing. This flaw does not allow for code execution or data leakage but results in denial of service by crashing the browser process. The vulnerability was addressed by Apple through improved memory management techniques and fixed in Safari version 26.2 and corresponding OS updates (iOS 18.7.2, iPadOS 18.7.2, macOS Tahoe 26.2, visionOS 26.2, watchOS 26.2). The CVSS v3.1 base score is 6.5, reflecting a medium severity level, with an attack vector of network (remote), low attack complexity, no privileges required, but user interaction is necessary (the user must visit a malicious web page). The scope is unchanged, meaning the impact is limited to the vulnerable component (Safari). There are no known exploits in the wild at the time of publication, but the vulnerability could be leveraged to cause denial-of-service conditions on affected devices. This vulnerability highlights the importance of robust memory management in web browsers to prevent crashes and maintain service availability.

The primary impact of CVE-2025-43511 is denial of service through unexpected process crashes of Safari when processing malicious web content. For organizations, this can disrupt business operations relying on Safari for web access, potentially causing productivity loss and user frustration. While the vulnerability does not compromise confidentiality or integrity, repeated crashes could be exploited to degrade service availability or be part of a larger attack chain. Enterprises with large deployments of Apple devices may face increased support and remediation costs. Additionally, critical systems that depend on Safari for web-based applications or internal portals could experience interruptions. Although no known exploits exist currently, the ease of triggering the crash via crafted web content and the wide user base of Safari increases the risk of opportunistic attacks. Organizations in sectors such as finance, healthcare, and government, where availability is crucial, may be particularly affected.

To mitigate CVE-2025-43511, organizations should promptly apply the security updates released by Apple, specifically Safari 26.2 and the corresponding OS versions: iOS 18.7.2, iPadOS 18.7.2, macOS Tahoe 26.2, visionOS 26.2, and watchOS 26.2. Beyond patching, organizations should implement network-level protections such as web filtering and intrusion prevention systems to block access to known malicious websites that could host crafted content exploiting this vulnerability. User awareness training should emphasize cautious browsing habits and the risks of visiting untrusted websites. For managed environments, consider restricting Safari usage or deploying alternative browsers where feasible until patches are applied. Monitoring for abnormal Safari crashes and correlating with web traffic can help detect potential exploitation attempts. Additionally, employing endpoint detection and response (EDR) solutions can assist in identifying anomalous process behavior related to this vulnerability. Regularly reviewing and updating security policies to include timely patch management for Apple devices is essential.