# CVE-2019-13943: Cross-site scripting in EN100 Ethernet module DNP3 variant

> Unauthenticated attackers can inject scripts into the web interface of Siemens EN100 modules to read or modify application content.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 12 Dec 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-x46f-47h6-v9jx

## What is CVE-2019-13943?

CVE-2019-13943 is a medium-severity cross-site scripting vulnerability in Siemens AG EN100 Ethernet module DNP3 variant, published on 12 Dec 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A vulnerability has been identified in EN100 Ethernet module DNP3 variant (All versions), EN100 Ethernet module IEC 61850 variant (All versions < V4.37), EN100 Ethernet module IEC104 variant (All versions), EN100 Ethernet module Modbus TCP variant (All versions), EN100 Ethernet module PROFINET IO variant (All versions). The web interface could allow Cross-Site Scripting (XSS) attacks if an attacker is able to modify content of particular web pages, causing the application to behave in unexpected ways for legitimate users. Successful exploitation does not require for an attacker to be authenticated to the web interface. This could allow the attacker to read or modify contents of the web application. At the time of advisory publication no public exploitation of this security. vulnerability was known.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2019-13943?

It affects 5 products.


Products: Siemens En100 Ethernet Module With Firmware Variant Dnp3 Tcp, Siemens En100 Ethernet Module With Firmware Variant Iec104, Siemens En100 Ethernet Module With Firmware Variant Iec 61850, Siemens En100 Ethernet Module With Firmware Variant Modbus Tcp, Siemens En100 Ethernet Module With Firmware Variant Profinet Io.

## How do I fix CVE-2019-13943?

No fix has been published for CVE-2019-13943 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-13943 being exploited?

There is no known exploitation of CVE-2019-13943 in the wild and no public exploit code.

## Other vulnerabilities in Siemens AG EN100 Ethernet module DNP3 variant

- [CVE-2019-13942](https://insights.sbomify.com/CVE-2019-13942/): Memory corruption in EN100 Ethernet module DNP3 variant (high 7.5)
- [CVE-2019-13944](https://insights.sbomify.com/CVE-2019-13944/): Path traversal in EN100 Ethernet module DNP3 variant (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-13943 and fix it if it is affected.

What it is: CVE-2019-13943 is a medium-severity cross-site scripting vulnerability in Siemens AG EN100 Ethernet module DNP3 variant, published on 12 Dec 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-13943 in the wild and no public exploit code.

Affected product: Siemens AG EN100 Ethernet module DNP3 variant. 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-2019-13943/ (Markdown: https://insights.sbomify.com/CVE-2019-13943/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-13943
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-13943
- OSV: https://osv.dev/vulnerability/CVE-2019-13943

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-13943/
Summaries are generated and may contain mistakes; the official description above is the record.