# CVE-2025-11618: A missing validation check in FreeRTOS-Plus-TCP's UDP/IPv6 packet processing code can lead to an invalid pointer…

Source: https://junglewise.ai/threats/cve-2025-11618-a-missing-validation-check-in-freertos-plus-tcp-s-udp-ipv6-packet  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-10-10  
License: CC BY 4.0 with a link back

CVE-2025-11618 · Severity: medium · CVSS 4.3 · Published 2025-10-10

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.

Technologies: [Amazon Freertos-Plus-Tcp](https://junglewise.ai/threats/technologies/amazon-freertos-plus-tcp). Vendors: [Amazon](https://junglewise.ai/threats/vendors/amazon).

## Quick answers

**Is CVE-2025-11618 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-11618 being exploited in the wild.

**How severe is CVE-2025-11618?** Medium severity, with a CVSS score of 4.3, published 10 October 2025.

**Which products and versions are affected?** Amazon Freertos-Plus-Tcp. The advisory does not name versions.

**Is there a fix for CVE-2025-11618?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2025-11618?** Check whether you run Amazon Freertos-Plus-Tcp. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Amazon Freertos-Plus-Tcp

## Related threats

- [Amazon FreeRTOS-Plus-TCP DNS resolver source verification bypass](https://junglewise.ai/threats/cve-2026-102552-improper-verification-of-the-source-of-a-communication-channel)
- [FreeRTOS-Plus-TCP improper source verification in IPv6 Router Advertisement and DNS resolver](https://junglewise.ai/threats/cve-2026-102551-amp-issue-with-freertos-plus-tcp)
- [Insufficient validation of the prefix length field in IPv6 Router Advertisement processing in FreeRTOS-Plus-TCP before…](https://junglewise.ai/threats/cve-2026-7426-insufficient-validation-of-the-prefix-length-field-in-ipv6-router)
- [Amazon FreeRTOS-Plus-TCP memory safety issues in IPv6 Router Advertisement](https://junglewise.ai/threats/cve-2026-7425-amazon-freertos-plus-tcp-memory-safety-issues-in-ipv6-router)
- [Amazon FreeRTOS-Plus-TCP integer underflow in DHCPv6 parser](https://junglewise.ai/threats/cve-2026-7424-amazon-freertos-plus-tcp-integer-underflow-in-dhcpv6-parser)