CVE-2026-102551: Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router Advertisement handling

Severity: high (CVSS 7.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-16 · updated 2026-10-19
Weakness: CWE-940

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.

Affected products

AWS FreeRTOS-Plus-TCP: through 4.4.1

References

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/security/advisories/GHSA-pjq5-fqrr-g6pv

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