What is the CVSS score of CVE-2025-43300?

CVE-2025-43300 has a CVSS 3.1 base score of 10.0 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.5%.

Which versions of Apple are affected by CVE-2025-43300?

Organizations using An out-of-bounds write face critical risk from CVE-2025-43300, a out-of-bounds write vulnerability rated CVSS 10.0.

Is there a public PoC exploit available for CVE-2025-43300?

Yes, a public proof-of-concept exploit is available for CVE-2025-43300. Prioritise patching immediately. EPSS: 0.5%.

How to fix or mitigate CVE-2025-43300?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. If patching is delayed, consider network segmentation to limit exposure.

Apple CVE-2025-43300

CRITICAL

Out-of-bounds Write (CWE-787)

2025-08-21 product-security@apple.com

Memory Corruption Buffer Overflow Apple

10.0

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

10.0 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Apr 03, 2026 - 14:28 cisa

CISA KEV

PoC Detected

Apr 03, 2026 - 14:28 vuln.today

Public exploit code

Analysis Generated

Mar 28, 2026 - 19:08 vuln.today

CVE Published

Aug 21, 2025 - 01:15 nvd

CRITICAL 10.0

DescriptionCVE.org

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS 15.8.5, iOS 16.7.12 and iPadOS 16.7.12. Processing a malicious image file may result in memory corruption. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals.

AnalysisAI

Apple iOS/iPadOS contain an out-of-bounds write in image processing that allows code execution through malicious images, exploited in extremely sophisticated targeted attacks against specific individuals.

Technical ContextAI

The CWE-787 out-of-bounds write in the image processing pipeline is triggered by malformed image data. The vulnerability affects older iOS versions (15.x, 16.x), indicating it was exploited before the latest security updates.