Apple Multiple Products Improper Locking Vulnerability (CVE-2025-43510)

Historical catalog analysis: CISA added this entry on March 20, 2026. 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-2025-43510 is an improper locking vulnerability (CWE-667) identified across several Apple operating systems. The flaw allows a malicious application to induce unexpected changes in memory that is shared between different processes. This type of vulnerability typically occurs when a system fails to properly synchronize access to a shared resource, potentially leading to data corruption or unauthorized state changes within the affected memory space.

Exposure and applicability

This vulnerability has broad applicability across the Apple ecosystem, affecting the following products:
* iOS
* iPadOS
* macOS
* watchOS
* tvOS
* visionOS

Organizations managing a fleet of Apple devices—including mobile handsets, tablets, laptops, and wearables—are exposed if these systems are running versions susceptible to this improper locking flaw. Because the vulnerability is listed in CISA’s Known Exploited Vulnerabilities (KEV) catalog as of March 20, 2026, it should be treated as a high-priority exposure.

Remediation priorities

Our analysis suggests that remediation should be prioritized based on the device’s role in the environment and its level of exposure to untrusted third-party applications.

1. Immediate Patching: The primary corrective action is to apply mitigations according to vendor instructions provided by Apple. Priority should be given to devices that execute a high volume of third-party software, as the vulnerability requires a malicious application to trigger the memory changes.
2. Asset Identification: Vulnerability management teams should identify all active instances of the affected operating systems across the enterprise to ensure no legacy or unmanaged devices remain unpatched.
3. Decommissioning: In scenarios where vendor mitigations are unavailable for older hardware/software versions, our analysis recommends discontinuing use of the product to eliminate the exposure path.

How to validate remediation

To verify that the risk has been reduced, defenders should move beyond simple version checks. While confirming the installation of a patched OS version is the first step, validation should include:
* Configuration Audit: Verifying that the update was successfully applied across all managed endpoints via Mobile Device Management (MDM) reports.
* Vendor Guidance Alignment: Ensuring the specific mitigation steps outlined in Apple’s support documentation for each respective OS have been fully executed.

It is important to note that a version string check alone does not prove that the memory locking issue is mitigated; verification must confirm the successful deployment of the vendor’s specific fix.

Limits and open questions

There are several unknowns regarding this vulnerability. While it is included in the KEV catalog, the specific nature of known ransomware campaign use remains listed as “Unknown.” Additionally, the source does not provide a detailed technical breakdown of the memory sharing mechanism involved or the specific prerequisites for a malicious application to successfully trigger the improper locking.

Residual risk remains if devices are kept in a state where updates are deferred or if third-party applications with high privileges are permitted on systems that cannot be patched. The effectiveness of the mitigation depends entirely on the successful application of vendor-supplied updates.

Source and editorial note

CVE-2025-43510: Apple Multiple Products Improper Locking Vulnerability · Source date: March 20, 2026 · 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: March 23, 2026. 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: September 17, 2026 at 00:23 UTC.

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