---
id: CVE-2026-102551
title: >-
  Improper verification of the source of a communication channel in
  FreeRTOS-Plus-TCP Router Advertisement handling
summary: >-
  Improper verification of the source of a communication channel in the IPv6
  Router Advertisement handler in Amazon FreeRTOS-Plus-TCP before V4.4.2 might
  allow a remote third-party to influence an endpoint's IPv6 default gateway,
  on-link p…
severity: high
cvss: 7.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L'
cvssSource: cna
cwe:
  - CWE-940
vendor: FreeRTOS
product: FreeRTOS-Plus-TCP
affected:
  - FreeRTOS-Plus-TCP <= 4.4.1
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T17:30:47.034Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-102551'
references:
  - url: 'https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.2'
  - url: 'https://aws.amazon.com/security/security-bulletins/2026-139-aws/'
  - url: >-
      https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-pjq5-fqrr-g6pv
tags:
  - cve.org
ingestedAt: '2026-10-16T18:43:08.787Z'
epss: 0.00273
epssPercentile: 0.18427
---

## Overview

Improper verification of the source of a communication channel in the IPv6 Router Advertisement handler in Amazon FreeRTOS-Plus-TCP before V4.4.2 might allow a remote third-party to influence an endpoint's IPv6 default gateway, on-link prefix, and address configuration via a crafted Router Advertisement.



To remediate this issue, users should upgrade to version V4.4.2.

## Affected

- `FreeRTOS-Plus-TCP <= 4.4.1`

## Remediation

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