CVE-2025-9557: Zephyrproject-Rtos Zephyr

High severity, CVSS 7.6. EPSS: 0.2% chance of exploitation in the next 30 days.

‭An out-of-bound write can lead to an arbitrary code execution. Even on devices with some form of memory protection, this can still lead to‬ ‭a crash and a resultant denial of service.‬

Affected products

• Zephyrproject-Rtos Zephyr

Published 2025-11-26. Last modified 2026-06-17.