Advisory Details

November 13th, 2025

Apple macOS WindowServer Excessive Iteration Denial-of-Service Vulnerability

ZDI-25-1005
ZDI-CAN-27348

CVE ID CVE-2025-43401
CVSS SCORE 4.3, AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
AFFECTED VENDORS Apple
AFFECTED PRODUCTS macOS
VULNERABILITY DETAILS

This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of Apple macOS. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the WindowServer component. The issue results from the lack of proper validation of user-supplied data, which can result in an excessively long loop. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
https://support.apple.com/en-ca/125635
DISCLOSURE TIMELINE
  • 2025-07-08 - Vulnerability reported to vendor
  • 2025-11-13 - Coordinated public release of advisory
  • 2025-11-13 - Advisory Updated
CREDIT wac
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