# CVE-2026-102552: Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP DNS resolver

> CVE-2026-102552: Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP DNS resolver. CVSS 5.9 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-102552
Last updated: 2026-10-19T13:16:53Z

- Published: 2026-10-16 17:28 UTC · Updated: 2026-10-19 13:16 UTC · Assigner: AMZN
- CVSS: 5.9 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS: 0.23%, 14th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-940

## Description

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 vendors and products

- FreeRTOS: FreeRTOS-Plus-TCP

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-102552)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-102552)
- [https://aws.amazon.com/security/security-bulletins/2026-139-aws/](https://aws.amazon.com/security/security-bulletins/2026-139-aws/)
- [https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.2](https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.2)
- [https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-h4fw-pv82-p7h5](https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-h4fw-pv82-p7h5)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-102552 · Markdown: https://rewindex.com/cve/CVE-2026-102552.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-102552 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:18.254Z