# CVE-2020-28395: Weak cryptography in SCALANCE X-200RNA switch family

> Attackers can decrypt previously captured traffic and perform man-in-the-middle attacks because devices reuse private keys after factory resets.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Jan 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-vfw8-4p7f-cjjh

## What is CVE-2020-28395?

CVE-2020-28395 is a medium-severity vulnerability in Siemens SCALANCE X-200RNA switch family, published on 12 Jan 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been identified in SCALANCE X-200RNA switch family (All versions < V3.2.7), SCALANCE X-300 switch family (incl. X408 and SIPLUS NET variants) (All versions < V4.1.0). Devices do not create a new unique private key after factory reset. An attacker could leverage this situation to a man-in-the-middle situation and decrypt previously captured traffic.

Weakness: CWE-798 (Use of Hard-coded Credentials), CWE-321 (Use of Hard-coded Cryptographic Key)

## Which versions are affected by CVE-2020-28395?

It affects 8 products.


Products: Siemens Scalance Xr324-12m Firmware, Siemens Scalance Xr324-12m Ts Firmware, Siemens Scalance Xr324-4m Eec Firmware, Siemens Scalance Xr324-4m Poe Firmware, Siemens Scalance Xr324-4m Poe Ts Firmware, Siemens Scalance Xr324wg Firmware, Siemens Scalance Xr326-2c Poe Wg Firmware, Siemens Scalance Xr328-4c Wg Firmware.

## How do I fix CVE-2020-28395?

No fix has been published for CVE-2020-28395 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-28395 being exploited?

There is no known exploitation of CVE-2020-28395 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-28395 and fix it if it is affected.

What it is: CVE-2020-28395 is a medium-severity vulnerability in Siemens SCALANCE X-200RNA switch family, published on 12 Jan 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-2020-28395 in the wild and no public exploit code.

Affected product: Siemens SCALANCE X-200RNA switch family. 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-2020-28395/ (Markdown: https://insights.sbomify.com/CVE-2020-28395/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-28395
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-28395
- OSV: https://osv.dev/vulnerability/CVE-2020-28395

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-28395/
Summaries are generated and may contain mistakes; the official description above is the record.