What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.4 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: 2025-10-10 · updated 2026-10-08
• Weakness: CWE-126

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

• AWS FreeRTOS-Plus-TCP: from 4.0.0 before 4.3.4 — fixed in 4.3.4

How to fix

Upgrade to a fixed version: AWS FreeRTOS-Plus-TCP 4.3.4. Check the vendor advisory for mitigations.

References

• https://aws.amazon.com/security/security-bulletins/AWS-2025-023/
• https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.3.4
• https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-8j9h-xjm9-8j6j

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