CVE-2025-43300 Apple CVE debrief

Who should care

Apple device administrators, endpoint security teams, IT operations, and incident response teams managing iPhone, iPad, or Mac fleets should prioritize this issue, especially in organizations that must track CISA KEV items on a fixed remediation timeline.

Technical summary

The supplied record identifies the issue as an out-of-bounds write in Apple iOS, iPadOS, and macOS. In general, out-of-bounds writes can corrupt memory and create reliability and security risk. The corpus does not include Apple’s advisory text or affected-version details, so the safest interpretation is limited to the vulnerability class, the affected product families, and the fact that CISA lists it as known exploited.

Defensive priority

High. Because CVE-2025-43300 is in CISA’s Known Exploited Vulnerabilities catalog, it should be treated as an urgent patch-or-mitigate item with attention to the 2025-09-11 due date.

Recommended defensive actions

• Apply Apple’s official remediation guidance for the affected iOS, iPadOS, and macOS releases as soon as practical.
• Verify exposure across all managed Apple devices, including BYOD devices that connect to corporate services if applicable.
• Track the CISA KEV due date of 2025-09-11 in remediation workflows and exception management.
• Use endpoint inventory and MDM reporting to confirm patch adoption and identify outliers.
• If immediate remediation is not possible, follow vendor instructions and compensating controls based on your internal risk policy.

Evidence notes

This debrief is constrained to the supplied KEV record and official links only. The source metadata states: vendor Apple; product iOS, iPadOS, and macOS; vulnerability name 'Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability'; dateAdded 2025-08-21; dueDate 2025-09-11; knownRansomwareCampaignUse Unknown. The CISA metadata also references Apple support pages 124925 through 124929 and the NVD detail page for CVE-2025-43300.

Official resources