Overview
Apple watchOS, iOS, iPadOS, macOS, visionOS, and tvOS contain a classic buffer overflow vulnerability which could allow a malicious application to cause unexpected system termination or write kernel memory.
https://support.apple.com/en-us/125632 ; https://support.apple.com/en-us/125633 ; https://support.apple.com/en-us/125634 ; https://support.apple.com/en-us/125635 ; https://support.apple.com/en-us/125636 ; https://support.apple.com/en-us/125637 ; https://support.apple.com/en-us/125638 ; https://support.apple.com/en-us/125639 ; https://nvd.nist.gov/vuln/detail/CVE-2025-43520
Key Details
| Property | Value |
|---|---|
| CVE ID | CVE-2025-43520 |
| Vendor / Product | Apple — Multiple Products |
| NVD Published | 2025-12-12 |
| NVD Last Modified | 2026-04-03 |
| CVSS 3.1 Score | 5.5 |
| CVSS 3.1 Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Severity | MEDIUM |
| CWE | CWE-120 |
| CISA KEV Added | 2026-03-20 |
| CISA KEV Deadline | 2026-04-03 |
| Known Ransomware Use | No |
CVSS 3.1 Breakdown
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Required Action
CISA BOD 22-01 Deadline: 2026-04-03.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Timeline
| Date | Event |
|---|---|
| 2026-03-20 | Added to CISA Known Exploited Vulnerabilities catalog |
| 2026-04-03 | CISA BOD 22-01 remediation deadline |
References
| Resource | Type |
|---|---|
| NVD — CVE-2025-43520 | Vulnerability Database |
| CISA KEV Catalog Entry | US Government |