# CVE-2015-5374: Denial of service in n/a

> Attackers can cause denial of service on EN100 Ethernet modules by sending crafted UDP packets to port 50000, requiring a manual reboot to recover.

- **Severity:** High 7.8 (`AV:N/AC:L/Au:N/C:N/I:N/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Jul 2015
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-26f6-7cv9-7mh6

## What is CVE-2015-5374?

CVE-2015-5374 is a high-severity denial of service vulnerability in n/a, published on 18 Jul 2015. 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 Firmware variant PROFINET IO for EN100 Ethernet module : All versions < V1.04.01; Firmware variant Modbus TCP for EN100 Ethernet module : All versions < V1.11.00; Firmware variant DNP3 TCP for EN100 Ethernet module : All versions < V1.03; Firmware variant IEC 104 for EN100 Ethernet module : All versions < V1.21; EN100 Ethernet module included in SIPROTEC Merging Unit 6MU80 : All versions < 1.02.02. Specially crafted packets sent to port 50000/UDP could cause a denial-of-service of the affected device. A manual reboot may be required to recover the service of the device.

Weakness: CWE-19

## Which versions are affected by CVE-2015-5374?

It affects 1 product.


Products: Siemens Siprotec Firmware.

## How do I fix CVE-2015-5374?

No fix has been published for CVE-2015-5374 yet. Limit exposure of the affected software until one is available.

## Is CVE-2015-5374 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2015-5374 exists.

Public exploit code:

- CVE-2015-5374 Denial of Service PoC (github_poc): https://github.com/can/CVE-2015-5374-DoS-PoC
- Siemens SIPROTEC 4 and SIPROTEC Compact EN100 Ethernet Module < 4.25 - Denial of Service (exploitdb)
- Siemens SIPROTEC 4 and SIPROTEC Compact EN100 Ethernet Module - Denial of Service (metasploit)

## Other vulnerabilities in n/a

- [CVE-2016-4784](https://insights.sbomify.com/CVE-2016-4784/): Information disclosure in n/a (medium 5.3)
- [CVE-2016-4785](https://insights.sbomify.com/CVE-2016-4785/): Information disclosure in n/a (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-5374 and fix it if it is affected.

What it is: CVE-2015-5374 is a high-severity denial of service vulnerability in n/a, published on 18 Jul 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2015-5374 exists.

Affected product: n/a. 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-2015-5374/ (Markdown: https://insights.sbomify.com/CVE-2015-5374/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-5374
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-5374
- OSV: https://osv.dev/vulnerability/CVE-2015-5374

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-5374/
Summaries are generated and may contain mistakes; the official description above is the record.