---
id: CVE-2025-9557
title: ‭An out-of-bound write can lead to an arbitrary code execution
summary: >-
  ‭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.‬
severity: high
cvss: 7.6
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H'
cwe:
  - CWE-120
published: '2025-11-26'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T20:17:01.290'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-9557'
references:
  - url: >-
      https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-r3j3-c5v7-2ppf
    label: vulnerabilities@zephyrproject.org
tags:
  - nvd
  - cve.org
epss: 0.00223
epssPercentile: 0.12832
ingestedAt: '2026-10-13T20:53:44.535Z'
vendor: zephyrproject-rtos
product: Zephyr
affected:
  - Zephyr < 4.2.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-11-26T14:10:48.507535Z'
---

## Overview

‭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.‬

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.