# CVE-2019-19279: Denial of service in SIPROTEC 4 and SIPROTEC Compact relays equipped with EN100 Ethernet communication modules

> Crafted UDP packets can crash SIPROTEC relays, requiring a manual reboot to restore service.

- **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:** 10 Mar 2020
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-f47r-9fwr-4p3h

## What is CVE-2019-19279?

CVE-2019-19279 is a high-severity denial of service vulnerability in Siemens AG SIPROTEC 4 and SIPROTEC Compact relays equipped with EN100 Ethernet communication modules, published on 10 Mar 2020. 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 SIPROTEC 4 and SIPROTEC Compact relays equipped with EN100 Ethernet communication modules (All versions). Specially crafted packets sent to port 50000/UDP of the EN100 Ethernet communication modules could cause a Denial-of-Service of the affected device. A manual reboot is required to recover the service of the device. At the time of advisory publication no public exploitation of this security vulnerability was known to Siemens.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2019-19279?

It affects 2 products.


Products: Siemens Siprotec 4, Siemens Siprotec Compact.

## How do I fix CVE-2019-19279?

No fix has been published for CVE-2019-19279 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-19279 being exploited?

There is no known exploitation of CVE-2019-19279 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-19279 and fix it if it is affected.

What it is: CVE-2019-19279 is a high-severity denial of service vulnerability in Siemens AG SIPROTEC 4 and SIPROTEC Compact relays equipped with EN100 Ethernet communication modules, published on 10 Mar 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-2019-19279 in the wild and no public exploit code.

Affected product: Siemens AG SIPROTEC 4 and SIPROTEC Compact relays equipped with EN100 Ethernet communication modules. 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-2019-19279/ (Markdown: https://insights.sbomify.com/CVE-2019-19279/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-19279
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-19279
- OSV: https://osv.dev/vulnerability/CVE-2019-19279

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-19279/
Summaries are generated and may contain mistakes; the official description above is the record.