CVE-2025-43300

ImageIO: 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.

CVE-2025-43300 is fixed in 3 products on 1 platform, first by Sequoia 15.6.1, released August 20, 2025. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on August 21, 2025. Patch Radar priority: Patch now.

Patch nowCISA KEV

CVSS

10.0

CRITICAL

Exploitation

Exploited

Reported by the vendor

CISA KEV

Aug 21, 2025

Federal due date Sep 11, 2025

EPSS

0.6516

99th percentile

An out-of-bounds write issue was addressed with improved bounds checking.

Where it's fixed

Product	Fixed in	Fix	Released
macOS
Sequoia	15.6.1	Sequoia 15.6.1	Aug 20, 2025
Sonoma	14.7.8	Sonoma 14.7.8	Aug 20, 2025
Ventura	13.7.8	Ventura 13.7.8	Aug 20, 2025

Details

Published
August 20, 2025
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor advisory
https://support.apple.com/en-us/124929

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