CVE-2026-102551: Freertos Freertos-Plus-TCP

High severity, CVSS 7.7. EPSS: 0.3% chance of exploitation in the next 30 days.

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 products

• Freertos Freertos-Plus-TCP: up to and including 4.4.1

Published 2026-10-16. Last modified 2026-10-16.