# CVE-2017-6021: Denial of service in ClearSCADA

> An attacker can cause the ClearSCADA server and communication drivers to terminate by sending specially crafted network packets, resulting in a denial of service.

- **Severity:** High 7.5 (`CVSS:3.0/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:** 14 May 2018
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-xc24-4mjv-9pwv

## What is CVE-2017-6021?

CVE-2017-6021 is a high-severity denial of service vulnerability in Schneider Electric SE ClearSCADA, published on 14 May 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In Schneider Electric ClearSCADA 2014 R1 (build 75.5210) and prior, 2014 R1.1 (build 75.5387) and prior, 2015 R1 (build 76.5648) and prior, and 2015 R2 (build 77.5882) and prior, an attacker with network access to the ClearSCADA server can send specially crafted sequences of commands and data packets to the ClearSCADA server that can cause the ClearSCADA server process and ClearSCADA communications driver processes to terminate. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2017-6021?

It affects 2 products.


Products: Aveva Clearscada, Schneider-Electric Clearscada.

## How do I fix CVE-2017-6021?

No fix has been published for CVE-2017-6021 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-6021 being exploited?

There is no known exploitation of CVE-2017-6021 in the wild and no public exploit code.

## Other vulnerabilities in Schneider Electric SE ClearSCADA

- [CVE-2011-3143](https://insights.sbomify.com/CVE-2011-3143/): Use after free in n/a (critical 10.0)
- [CVE-2017-9962](https://insights.sbomify.com/CVE-2017-9962/): Memory corruption in ClearSCADA (high 7.5)
- [CVE-2014-0779](https://insights.sbomify.com/CVE-2014-0779/): Memory corruption in ClearSCADA (medium 6.8)
- [CVE-2014-5412](https://insights.sbomify.com/CVE-2014-5412/): Schneider Electric SCADA Expert ClearSCADA Improper Authentication (medium 6.4)
- [CVE-2014-5413](https://insights.sbomify.com/CVE-2014-5413/): Schneider Electric SCADA Expert ClearSCADA Cryptographic Issues (medium 6.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-6021 and fix it if it is affected.

What it is: CVE-2017-6021 is a high-severity denial of service vulnerability in Schneider Electric SE ClearSCADA, published on 14 May 2018. 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-2017-6021 in the wild and no public exploit code.

Affected product: Schneider Electric SE ClearSCADA. 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-2017-6021/ (Markdown: https://insights.sbomify.com/CVE-2017-6021/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-6021
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-6021
- OSV: https://osv.dev/vulnerability/CVE-2017-6021

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-6021/
Summaries are generated and may contain mistakes; the official description above is the record.