CVE-2025-43300: 
macOS vulnerability analysis and mitigation

CVE-2025-43300 is a critical out-of-bounds write vulnerability discovered in Apple's ImageIO framework. The vulnerability was disclosed on August 20, 2025, affecting iOS, iPadOS, and macOS operating systems. The issue impacts multiple Apple devices including iPhone XS and later models, various iPad Pro generations, and Mac computers running different OS versions. Apple internally discovered this vulnerability and confirmed it has been actively exploited in targeted attacks (Apple Advisory, NVD).

The vulnerability is an out-of-bounds write issue in the ImageIO framework with a CVSS score of 8.8 (HIGH). The flaw can be triggered when processing a malicious image file, potentially leading to memory corruption. Apple addressed this vulnerability by implementing improved bounds checking. The issue has been classified under CWE-787 (Out-of-bounds Write) (Hacker News, Help Net Security).

When exploited, CVE-2025-43300 can result in memory corruption through the processing of a malicious image file. The vulnerability has been confirmed to be exploited in extremely sophisticated attacks targeting specific individuals. Given its high CVSS score of 8.8, successful exploitation could potentially lead to arbitrary code execution with the privileges of the target application (NVD, Apple Advisory).

Apple has released security updates to address CVE-2025-43300 across multiple platforms: iOS 18.6.2 and iPadOS 18.6.2, iPadOS 17.7.10, macOS Sonoma 14.7.8, macOS Ventura 13.7.8, and macOS Sequoia 15.6.1. Users are strongly advised to update their devices immediately to the latest available versions. CISA has added this vulnerability to its Known Exploited Vulnerabilities Catalog, requiring federal agencies to apply patches by September 11, 2025 (NVD, Apple Advisory).