CVE-2025-9557

HIGH

Zephyr RTOS <= 4.2 - Out-of-Bounds Write

Title source: llm
STIX 2.1

Description

‭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.‬

References (1)

Core 1

Scores

CVSS v3 7.6
EPSS 0.0003
EPSS Percentile 8.0%
Attack Vector ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-120
Status published
Products (1)
zephyrproject-rtos/Zephyr < 4.2
Published Nov 26, 2025
Tracked Since Feb 18, 2026