# CVE-2023-6711: Memory corruption in RTU500 series CMU Firmware

> Attackers can cause a reboot of Hitachi Energy RTU500 CMU devices by sending specially crafted messages that trigger a buffer overflow.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Dec 2023
- **Updated:** 25 Sep 2024
- **Also known as:** GHSA-x25m-g22v-6hgf

## What is CVE-2023-6711?

CVE-2023-6711 is a medium-severity memory corruption vulnerability in Hitachi Energy RTU500 series CMU Firmware, published on 19 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Vulnerability exists in SCI IEC 60870-5-104 and HCI IEC 60870-5-104 that affects the RTU500 series product versions listed below. Specially crafted messages sent to the mentioned components are not validated properly and can result in buffer overflow and as final consequence to a reboot of an RTU500 CMU.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2023-6711?

It affects 1 product.


Products: Hitachienergy Rtu500 Firmware.

## How do I fix CVE-2023-6711?

No fix has been published for CVE-2023-6711 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-6711 being exploited?

There is no known exploitation of CVE-2023-6711 in the wild and no public exploit code.

## Other vulnerabilities in Hitachi Energy RTU500 series CMU Firmware

- [CVE-2022-2502](https://insights.sbomify.com/CVE-2022-2502/): Denial of service in RTU500 series (high 7.5)
- [CVE-2022-4608](https://insights.sbomify.com/CVE-2022-4608/): Memory corruption in RTU500 series (high 7.5)
- [CVE-2021-35533](https://insights.sbomify.com/CVE-2021-35533/): Specially Crafted IEC 60870-5-104 Packet Vulnerability in RTU500 series (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-6711 and fix it if it is affected.

What it is: CVE-2023-6711 is a medium-severity memory corruption vulnerability in Hitachi Energy RTU500 series CMU Firmware, published on 19 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-6711 in the wild and no public exploit code.

Affected product: Hitachi Energy RTU500 series CMU Firmware. 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-2023-6711/ (Markdown: https://insights.sbomify.com/CVE-2023-6711/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-6711
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-6711
- OSV: https://osv.dev/vulnerability/CVE-2023-6711

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-6711/
Summaries are generated and may contain mistakes; the official description above is the record.