CVE-2025-43457 is a use-after-free vulnerability classified under CWE-416 that affects Apple Safari and related operating systems including watchOS, macOS, iOS, iPadOS, and visionOS. The flaw arises from improper memory management when processing certain crafted web content, leading to the potential for Safari to crash unexpectedly. This vulnerability does not allow for code execution or data leakage but results in a denial-of-service condition by crashing the browser, impacting availability. The CVSS v3.1 base score is 6.5, reflecting network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), unchanged scope (S:U), no impact on confidentiality or integrity (C:N/I:N), and high impact on availability (A:H). The vulnerability affects unspecified versions prior to Safari 26.1 and corresponding OS versions 26.1 where the issue has been fixed by improved memory management. No known exploits have been reported in the wild, but the potential for denial-of-service attacks exists if users visit maliciously crafted web pages. The vulnerability was reserved in April 2025 and published in November 2025. Given the broad platform coverage, the vulnerability could impact a wide range of Apple device users.

For European organizations, this vulnerability primarily poses a risk of denial-of-service through browser crashes, which can disrupt business operations, especially in environments relying heavily on Safari for web applications or internal tools. While it does not compromise data confidentiality or integrity, repeated crashes could degrade user productivity and potentially interrupt critical services. Organizations in sectors such as finance, healthcare, and government that use Apple devices extensively may face operational challenges. Additionally, if attackers leverage this vulnerability in targeted campaigns, it could be used as a distraction or to degrade user experience during more complex multi-stage attacks. The lack of known exploits reduces immediate risk but does not eliminate the need for vigilance. The requirement for user interaction (visiting a malicious web page) means that phishing or social engineering could be vectors for exploitation.

European organizations should prioritize updating all affected Apple devices and Safari browsers to version 26.1 or later as soon as possible to remediate the vulnerability. Beyond patching, organizations should implement strict web content filtering and restrict access to untrusted or suspicious websites to reduce exposure. Employing endpoint protection solutions that monitor for abnormal application crashes can help detect exploitation attempts. User awareness training should emphasize caution when clicking unknown links or visiting unfamiliar websites, reducing the likelihood of triggering the vulnerability. Network-level protections such as DNS filtering and web proxies can block access to known malicious domains. For critical environments, consider deploying alternative browsers temporarily until patches are applied. Regular vulnerability scanning and asset inventory management will ensure all affected systems are identified and remediated promptly.