What’s Vulnerable › Vulnerabilities

CVE-2025-11617: Buffer Over-read when receiving IPv6 packets with incorrect payload length 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 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

• 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-wmjr-wm93-cvv2

Get alerted when CVE-2025-11617 or the next vulnerability affects your stack