# CVE-2021-20592: Race condition in GOT2000 series GT27 model; GT25 model; GT23 model; GT SoftGOT2000

> Remote unauthenticated attackers can cause denial of service on Mitsubishi GOT HMI devices by rapidly connecting and disconnecting from the MODBUS/TCP port.

- **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:** 5 Aug 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-g27q-pw4h-7p4g

## What is CVE-2021-20592?

CVE-2021-20592 is a high-severity vulnerability in GOT2000 series GT27 model; GT25 model; GT23 model; GT SoftGOT2000, published on 5 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Missing synchronization vulnerability in GOT2000 series GT27 model communication driver versions 01.19.000 through 01.39.010, GT25 model communication driver versions 01.19.000 through 01.39.010 and GT23 model communication driver versions 01.19.000 through 01.39.010 and GT SoftGOT2000 versions 1.170C through 1.256S allows a remote unauthenticated attacker to cause DoS condition on the MODBUS/TCP slave communication function of the products by rapidly and repeatedly connecting and disconnecting to and from the MODBUS/TCP communication port on a target. Restart or reset is required to recover.

Weakness: CWE-662 (Improper Synchronization)

## Which versions are affected by CVE-2021-20592?

It affects 4 products.


Products: Mitsubishielectric Got2000 Gt23 Firmware, Mitsubishielectric Got2000 Gt25 Firmware, Mitsubishielectric Got2000 Gt27 Firmware, Mitsubishielectric Gt Softgot2000.

## How do I fix CVE-2021-20592?

No fix has been published for CVE-2021-20592 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20592 being exploited?

There is no known exploitation of CVE-2021-20592 in the wild and no public exploit code.

## Other vulnerabilities in GOT2000 series GT27 model; GT25 model; GT23 model; GT SoftGOT2000

- [CVE-2022-40266](https://insights.sbomify.com/CVE-2022-40266/): Denial-of-Service (DoS) Vulnerability in FTP Server Function on GOT2000 Series (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20592 and fix it if it is affected.

What it is: CVE-2021-20592 is a high-severity vulnerability in GOT2000 series GT27 model; GT25 model; GT23 model; GT SoftGOT2000, published on 5 Aug 2021. 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-2021-20592 in the wild and no public exploit code.

Affected product: GOT2000 series GT27 model; GT25 model; GT23 model; GT SoftGOT2000. 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-2021-20592/ (Markdown: https://insights.sbomify.com/CVE-2021-20592/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20592
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20592
- OSV: https://osv.dev/vulnerability/CVE-2021-20592

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-20592/
Summaries are generated and may contain mistakes; the official description above is the record.