CVE-2026-102552

MEDIUM 5.9

Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP DNS resolver

CVSS Score

5.9

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-940
Vendor	freertos
Product	freertos-plus-tcp
Published	Oct 16, 2026
Last Updated	Oct 16, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

FreeRTOS / FreeRTOS-Plus-TCP

0 ≤ 4.4.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.2 aws.amazon.com: https://aws.amazon.com/security/security-bulletins/2026-139-aws/ github.com: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-h4fw-pv82-p7h5

Credits

Causal Security