---
id: CVE-2026-102552
title: >-
  Improper verification of the source of a communication channel in
  FreeRTOS-Plus-TCP DNS resolver
summary: >-
  Improper verification of the source of a communication channel in the DNS
  resolver in Amazon FreeRTOS-Plus-TCP before V4.4.2 might allow remote
  third-party to insert a chosen address into the device's DNS cache via a
  forged DNS reply.



  …
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'
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: '2026-10-16T17:32:15.640Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-102552'
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-h4fw-pv82-p7h5
tags:
  - cve.org
ingestedAt: '2026-10-16T18:43:08.771Z'
---

## Overview

Improper verification of the source of a communication channel in the DNS resolver in Amazon FreeRTOS-Plus-TCP before V4.4.2 might allow remote third-party to insert a chosen address into the device's DNS cache via a forged DNS reply.



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

## Affected

- `FreeRTOS-Plus-TCP <= 4.4.1`

## Remediation

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