---
id: CVE-2025-12899
title: >-
  A flaw in Zephyr’s network stack allows an IPv4 packet containing ICMP type
  128 to be misclassified as an ICMPv6 Echo Request
summary: >-
  A flaw in Zephyr’s network stack allows an IPv4 packet containing ICMP type
  128 to be misclassified as an ICMPv6 Echo Request. This results in an
  out-of-bounds memory read and creates a potential information-leak
  vulnerability in the net…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'
cwe:
  - CWE-843
published: '2026-01-30'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T20:17:00.383'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-12899'
references:
  - url: >-
      https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-c2vg-hj83-c2vg
    label: vulnerabilities@zephyrproject.org
tags:
  - nvd
epss: 0.00339
epssPercentile: 0.25505
ingestedAt: '2026-10-13T20:53:44.536Z'
---

## Overview

A flaw in Zephyr’s network stack allows an IPv4 packet containing ICMP type 128 to be misclassified as an ICMPv6 Echo Request. This results in an out-of-bounds memory read and creates a potential information-leak vulnerability in the networking subsystem.

## Remediation

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