CVE-2025-11618

Medium

Description

A missing validation check in FreeRTOS-Plus-TCP's UDP/IPv6 packet processing code can lead to an invalid pointer dereference when receiving a UDP/IPv6 packet with an incorrect IP version field in the packet header. This issue only affects applications using IPv6. We recommend upgrading to the latest version and ensure any forked or derivative code is patched to incorporate the new fixes.

SeverityMedium

CVSS4.3

Exploit probability—

ProductAmazon Freertos-plus-tcp

PublishedOct 10, 2025

First seenOct 10, 2025

Weakness typeCWE-476NULL pointer dereference

How to fix

Update

amazon freertos-plus-tcp4.3.4, 4.2.5 or later

Patches

github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.3.4

Vendor advisories

Affected products

Product	Affected versions	Fixed in
amazon freertos-plus-tcp	4.0.0 ≤ v < 4.3.4, 4.0.0 ≤ v < 4.2.5, 4.3.0 ≤ v < 4.3.4	4.3.4, 4.2.5

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