CVE-2026-102551

Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router Advertisement handling

State: Published
Severity: 9.2 Critical
Published: Oct 16, 2026
Updated: Oct 19, 2026
Reserved: Sep 29, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	9.2 Critical	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N	AMZN
3.1	7.7 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L	AMZN

Weaknesses

CWE-940 Improper verification of source of a communication channel

Affected Products

Product	Versions
FreeRTOS-Plus-TCPFreeRTOS	4.4.1 and earlierAffected

References

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.2release-notespatch
https://aws.amazon.com/security/security-bulletins/2026-139-aws/vendor-advisory
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-pjq5-fqrr-g6pvthird-party-advisory

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