# CVE-2020-5646: Null dereference in GT14 Model of GOT 1000 series

> Remote unauthenticated attackers can cause denial of service in Mitsubishi GOT 1000 series HMIs via crafted packets triggering a null pointer dereference.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/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:** 6 Nov 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-rhf6-xfw9-38h3

## What is CVE-2020-5646?

CVE-2020-5646 is a high-severity vulnerability in Mitsubishi Electric Corporation GT14 Model of GOT 1000 series, published on 6 Nov 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

NULL pointer dereferences vulnerability in TCP/IP function included in the firmware of GT14 Model of GOT 1000 series (GT1455-QTBDE CoreOS version "05.65.00.BD" and earlier, GT1450-QMBDE CoreOS version "05.65.00.BD" and earlier, GT1450-QLBDE CoreOS version "05.65.00.BD" and earlier, GT1455HS-QTBDE CoreOS version "05.65.00.BD" and earlier, and GT1450HS-QMBDE CoreOS version "05.65.00.BD" and earlier) allows a remote unauthenticated attacker to stop the network functions of the products via a specially crafted packet.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2020-5646?

It affects 1 product.


Products: Mitsubishielectric Coreos.

## How do I fix CVE-2020-5646?

No fix has been published for CVE-2020-5646 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-5646 being exploited?

There is no known exploitation of CVE-2020-5646 in the wild and no public exploit code.

## Other vulnerabilities in Mitsubishi Electric Corporation GT14 Model of GOT 1000 series

- [CVE-2020-5644](https://insights.sbomify.com/CVE-2020-5644/): Memory corruption in GT14 Model of GOT 1000 series (critical 9.8)
- [CVE-2020-5647](https://insights.sbomify.com/CVE-2020-5647/): Missing authorization in GT14 Model of GOT 1000 series (critical 9.8)
- [CVE-2020-5648](https://insights.sbomify.com/CVE-2020-5648/): Command injection in GT14 Model of GOT 1000 series (critical 9.8)
- [CVE-2020-5595](https://insights.sbomify.com/CVE-2020-5595/): Memory corruption in GOT2000 series GT27, GT25, and GT23 (critical 9.8)
- [CVE-2020-5599](https://insights.sbomify.com/CVE-2020-5599/): Command injection in GOT2000 series GT27, GT25, and GT23 (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5646 and fix it if it is affected.

What it is: CVE-2020-5646 is a high-severity vulnerability in Mitsubishi Electric Corporation GT14 Model of GOT 1000 series, published on 6 Nov 2020. 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-2020-5646 in the wild and no public exploit code.

Affected product: Mitsubishi Electric Corporation GT14 Model of GOT 1000 series. 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-2020-5646/ (Markdown: https://insights.sbomify.com/CVE-2020-5646/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5646
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5646
- OSV: https://osv.dev/vulnerability/CVE-2020-5646

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5646/
Summaries are generated and may contain mistakes; the official description above is the record.