Historical catalog analysis: CISA added this entry on August 21, 2025. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.
What the vulnerability is
CVE-2025-43300 is an out-of-bounds write vulnerability (CWE-787) located within the Image I/O framework of Apple’s operating systems. This flaw affects iOS, iPadOS, and macOS. On August 21, 2025, the Cybersecurity and Infrastructure Security Agency (CISA) added this vulnerability to its Known Exploited Vulnerabilities (KEV) catalog, indicating that there is evidence of active exploitation in the wild.
Exposure and applicability
In healthcare settings, these operating systems are frequently utilized on tablets for bedside charting, smartphones for secure clinical communication, and workstations for administrative tasks and ePHI management. Because the vulnerability resides in the Image I/O framework—a component responsible for processing image files—any device that renders images via this framework could be exposed. This includes devices used by clinicians to view diagnostic images or by administrative staff handling patient documentation.
Remediation priorities
Our analysis suggests that healthcare organizations prioritize updates based on the device’s role in accessing sensitive data and its exposure to external inputs. We recommend the following prioritized actions:
- Immediate Patching of High-Exposure Devices: Prioritize the application of vendor-supplied updates for macOS workstations and mobile devices (iOS/iPadOS) that are used to receive files or images from external, untrusted sources.
- MDM-Driven Deployment: Security leaders should utilize Mobile Device Management (MDM) tools to push the latest OS versions across the fleet to ensure consistency in protection levels.
- Inventory Review: Clinical engineering and IT teams should identify any legacy Apple devices that may no longer receive updates, as these remain permanently vulnerable if they continue to use the affected Image I/O framework.
How to validate remediation
To verify that exposure has been reduced, organizations can employ the following methods:
- Version Auditing: Use MDM reports or system settings to confirm that all deployed devices are running the specific OS versions identified by Apple as containing the fix for CVE-2025-43300.
- Compliance Scanning: Utilize authorized vulnerability scanners to identify outdated OS versions across the network.
It is important to note that verifying a version number confirms the update was applied, but it does not guarantee absolute security against all future or unknown exploits.
Limits and open questions
While CISA has confirmed active exploitation, the specific methods of delivery (e.g., via email, web browsing, or messaging apps) are not detailed in the provided source. Additionally, it is currently unknown if this vulnerability has been utilized in ransomware campaigns targeting healthcare entities. Organizations should remain aware that patching addresses the known flaw but does not eliminate residual risks associated with other undiscovered vulnerabilities in image processing frameworks.
Source and editorial note
CVE-2025-43300: Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability · Source date: August 21, 2025 · Retrieved August 31, 2026.
Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.
Archive date: August 24, 2025. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: October 02, 2026 at 00:53 UTC.
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