What’s Vulnerable › Vulnerabilities

CVE-2025-11618: Invalid Pointer Dereference when receiving UDP/IPv6 packets in FreeRTOS-Plus-TCP

• Severity: medium (CVSS 4.3 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-476

Description

A missing validation check in FreeRTOS-Plus-TCP's UDP/IPv6 packet processing code can lead to an invalid pointer dereference when receiving a UDP/IPv6 packet with an incorrect IP version field in the packet header. This issue only affects applications using IPv6. We recommend upgrading 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-6fh9-mqxj-hmwj

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