# CVE-2025-11617: Buffer Over-read when receiving IPv6 packets with incorrect payload length in FreeRTOS-Plus-TCP

> An out-of-bounds read in FreeRTOS-Plus-TCP allows attackers to disclose memory or cause denial of service via crafted IPv6 packets.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Oct 2025
- **Updated:** 10 Oct 2025
- **Also known as:** GHSA-wmjr-wm93-cvv2

## What is CVE-2025-11617?

CVE-2025-11617 is a medium-severity memory corruption vulnerability in AWS FreeRTOS-Plus-TCP, published on 10 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### 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.

Weakness: CWE-126 (Buffer Over-read)

## Which versions are affected by CVE-2025-11617?

It affects 1 product.


Products: Amazon Freertos-Plus-Tcp.

## How do I fix CVE-2025-11617?

No fix has been published for CVE-2025-11617 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-11617 being exploited?

There is no known exploitation of CVE-2025-11617 in the wild and no public exploit code.

## Other vulnerabilities in AWS FreeRTOS-Plus-TCP

- [CVE-2024-38373](https://insights.sbomify.com/CVE-2024-38373/): FreeRTOS-Plus-TCP Buffer Over-Read in DNS Response Parser (critical 9.6)
- [CVE-2026-7424](https://insights.sbomify.com/CVE-2026-7424/): Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP (high 7.2)
- [CVE-2026-7422](https://insights.sbomify.com/CVE-2026-7422/): MAC Address Validation Bypass in FreeRTOS-Plus-TCP IPv4 and IPv6 Packet Processing (high 7.1)
- [CVE-2026-7426](https://insights.sbomify.com/CVE-2026-7426/): Out-of-Bounds Write via Unsanitized Prefix Length in Router Advertisement Processing in FreeRTOS-Plus-TCP (medium 6.1)
- [CVE-2026-7423](https://insights.sbomify.com/CVE-2026-7423/): Integer Underflow in ICMP Echo Reply Processing in FreeRTOS-Plus-TCP (medium 6.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-11617 and fix it if it is affected.

What it is: CVE-2025-11617 is a medium-severity memory corruption vulnerability in AWS FreeRTOS-Plus-TCP, published on 10 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-11617 in the wild and no public exploit code.

Affected product: AWS FreeRTOS-Plus-TCP. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-11617/ (Markdown: https://insights.sbomify.com/CVE-2025-11617/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-11617
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-11617
- OSV: https://osv.dev/vulnerability/CVE-2025-11617

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-11617/
Summaries are generated and may contain mistakes; the official description above is the record.