# CVE-2020-6994: Memory corruption in HiOS for the following devices RSP, RSPE, RSPS, RSPL, MSP, EES, EES, EESX, GRS, OS, RED

> Buffer overflow in Hirschmann HiOS/HiSecOS devices allows remote code execution or denial of service via crafted HTTP requests.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 3 Apr 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-299q-28qj-ch6v

## What is CVE-2020-6994?

CVE-2020-6994 is a critical memory corruption vulnerability in Hirschmann Automation and Control GmbH, a division of Belden Inc. HiOS for the following devices RSP, RSPE, RSPS, RSPL, MSP, EES, EES, EESX, GRS, OS, RED, published on 3 Apr 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A buffer overflow vulnerability was found in some devices of Hirschmann Automation and Control HiOS and HiSecOS. The vulnerability is due to improper parsing of URL arguments. An attacker could exploit this vulnerability by specially crafting HTTP requests to overflow an internal buffer. The following devices using HiOS Version 07.0.02 and lower are affected: RSP, RSPE, RSPS, RSPL, MSP, EES, EES, EESX, GRS, OS, RED. The following devices using HiSecOS Version 03.2.00 and lower are affected: EAGLE20/30.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input), CWE-12 (ASP.NET Misconfiguration: Missing Custom Error Page)

## Which versions are affected by CVE-2020-6994?

It affects 2 products.


Products: Belden Hirschmann Hios, Belden Hirschmann Hisecos.

## How do I fix CVE-2020-6994?

No fix has been published for CVE-2020-6994 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-6994 being exploited?

There is no known exploitation of CVE-2020-6994 in the wild and no public exploit code.

## Other vulnerabilities in Hirschmann Automation and Control GmbH, a division of Belden Inc. HiOS for the following devices RSP, RSPE, RSPS, RSPL, MSP, EES, EES, EESX, GRS, OS, RED

- [CVE-2021-27734](https://insights.sbomify.com/CVE-2021-27734/): Auth bypass in n/a (critical 9.8)
- [CVE-2020-9307](https://insights.sbomify.com/CVE-2020-9307/): Denial of service in n/a (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-6994 and fix it if it is affected.

What it is: CVE-2020-6994 is a critical memory corruption vulnerability in Hirschmann Automation and Control GmbH, a division of Belden Inc. HiOS for the following devices RSP, RSPE, RSPS, RSPL, MSP, EES, EES, EESX, GRS, OS, RED, published on 3 Apr 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-2020-6994 in the wild and no public exploit code.

Affected product: Hirschmann Automation and Control GmbH, a division of Belden Inc. HiOS for the following devices RSP, RSPE, RSPS, RSPL, MSP, EES, EES, EESX, GRS, OS, RED. 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-2020-6994/ (Markdown: https://insights.sbomify.com/CVE-2020-6994/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-6994
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-6994
- OSV: https://osv.dev/vulnerability/CVE-2020-6994

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-6994/
Summaries are generated and may contain mistakes; the official description above is the record.