CVE-2016-7621 Apple CVE debrief

Who should care

Apple device owners and administrators, especially teams managing iOS, macOS, and watchOS fleets through MDM or similar tooling. It matters most where local access is shared, lightly controlled, or available to untrusted users.

Technical summary

The issue is described as a kernel use-after-free (CWE-416). NVD assigns a CVSS v3.0 vector of AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, reflecting a local attack requiring low privileges but with potential for full compromise impact. The CVE description says affected versions are iOS before 10.2, macOS before 10.12.2, and watchOS before 3.1.3.

Defensive priority

High for affected endpoints because this is a kernel vulnerability with privilege-escalation potential. Prioritize any device that still runs the affected Apple OS versions, especially systems that permit local logins or run untrusted user workloads.

Recommended defensive actions

• Update iOS to 10.2 or later, macOS to 10.12.2 or later, and watchOS to 3.1.3 or later, per the CVE description.
• Inventory Apple devices to confirm no systems remain on affected releases.
• Prioritize remediation for shared, kiosk, lab, or developer devices where local access is more likely.
• Treat unexplained kernel crashes or instability on unpatched systems as a reason to expedite patch validation and deployment.
• Use MDM or fleet-management controls to verify remediation status and prevent drift back to vulnerable versions.

Evidence notes

The supplied corpus states this is a kernel component issue in Apple products and identifies it as a use-after-free. The CVE description explicitly says it may allow local arbitrary code execution in a privileged context or cause denial of service. NVD also lists CWE-416 and the CVSS vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Note: the narrative summary in the CVE description and the NVD CPE version ranges are not perfectly aligned, so the descriptive version boundaries from the CVE text were used for remediation guidance.

Official resources