Vulnerability · Published Oct 10, 2025 · Assigned by AMZN

CVE-2025-11617Buffer Over-read when receiving IPv6 packets with incorrect payload length 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 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 (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-wmjr-wm93-cvv2 third-party-advisory