Medium · 5.4 CVE-2025-11617 EUVD-2025-33753

Buffer Over-read when receiving IPv6 packets with incorrect payload length in FreeRTOS-Plus-TCP

Published Oct 10, 2025 · Updated Oct 10, 2025 · Assigned by AMZN

Description

A missing validation check in FreeRTOS-Plus-TCP's IPv6 packet processing code can lead to an out-of-bounds read when receiving a IPv6 packet with incorrect payload lengths in the packet header. This issue only affects applications using IPv6.

We recommend users upgrade to the latest version and ensure any forked or derivative code is patched to incorporate the new fixes.

Affected products

Vendor	Product	Affected	Fixed
AWS	FreeRTOS-Plus-TCP	4.0.0 – < 4.3.4	4.3.4

References

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.3.4 patch product
https://aws.amazon.com/security/security-bulletins/AWS-2025-023/ vendor-advisory
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-wmjr-wm93-cvv2 third-party-advisory

CNA	v4.0	5.3
CNA	v3.1	5.4
EUVD	v4.0	5.3