Vulnerability · Published Oct 10, 2025 · Assigned by AMZN

CVE-2025-11616Buffer Over-read when receiving improperly sized ICMPv6 packets in FreeRTOS-Plus-TCP

Medium 5.4

In plain English

A medium-severity security flaw in FreeRTOS-Plus_TCP from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.3%top 75.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A missing validation check in FreeRTOS-Plus-TCP's ICMPv6 packet processing code can lead to an out-of-bounds read when receiving ICMPv6 packets of certain message types which are smaller than the expected size. These issues only affect applications using IPv6. Users should upgrade to the latest version and ensure any forked or derivative code is patched to incorporate the new fixes.

Affected products (as reported)

Vendor	Product	Versions
AWS	FreeRTOS-Plus_TCP	4.0.0 – before 4.3.4

Weakness: CWE-126 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

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-8j9h-xjm9-8j6j third-party-advisory