# CVE-2019-6568: Denial of service in SIMATIC CP 1604

> An attacker can cause a denial of service by restarting the webserver on affected Siemens SIMATIC devices without privileges or user interaction.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Apr 2019
- **Updated:** 3 Jun 2026
- **Also known as:** GHSA-gm8r-2vc4-2wvx

## What is CVE-2019-6568?

CVE-2019-6568 is a high-severity denial of service vulnerability in Siemens SIMATIC CP 1604, published on 17 Apr 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The webserver of the affected devices contains a vulnerability that may lead to
a denial of service condition. An attacker may cause a denial of service
situation which leads to a restart of the webserver of the affected device.

The security vulnerability could be exploited by an attacker with network
access to the affected systems. Successful exploitation requires no system
privileges and no user interaction. An attacker could use the vulnerability
to compromise availability of the device.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2019-6568?

It affects 53 products.


Products: Siemens Cp1604 Firmware, Siemens Cp1616 Firmware, Siemens Simatic Cp343-1 Advanced Firmware, Siemens Simatic Cp443-1 Advanced Firmware, Siemens Simatic Cp443-1 Firmware, Siemens Simatic Cp443-1 Opc Ua, Siemens Simatic Et 200 Sp Open Controller Cpu 1515sp Pc2 Firmware, Siemens Simatic Et 200 Sp Open Controller Cpu 1515sp Pc Firmware, Siemens Simatic Hmi Comfort Outdoor Panels Firmware, Siemens Simatic Hmi Comfort Panels Firmware, Siemens Simatic Hmi Ktp Mobile Panels Ktp400f Firmware, Siemens Simatic Hmi Ktp Mobile Panels Ktp700 Firmware, Siemens Simatic Hmi Ktp Mobile Panels Ktp700f Firmware, Siemens Simatic Hmi Ktp Mobile Panels Ktp900 Firmware, Siemens Simatic Hmi Ktp Mobile Panels Ktp900f Firmware, Siemens Simatic Ipc Diagmonitor, Siemens Simatic Rf181-Eip Firmware, Siemens Simatic Rf182c Firmware, Siemens Simatic Rf185c Firmware, Siemens Simatic Rf186c Firmware and 33 more.

## How do I fix CVE-2019-6568?

No fix has been published for CVE-2019-6568 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-6568 being exploited?

There is no known exploitation of CVE-2019-6568 in the wild and no public exploit code.

## Other vulnerabilities in Siemens SIMATIC CP 1604

- [CVE-2019-10923](https://insights.sbomify.com/CVE-2019-10923/): Denial of service in Development/Evaluation Kits for PROFINET IO: DK Standard Ethernet Controller (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-6568 and fix it if it is affected.

What it is: CVE-2019-6568 is a high-severity denial of service vulnerability in Siemens SIMATIC CP 1604, published on 17 Apr 2019. 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-2019-6568 in the wild and no public exploit code.

Affected product: Siemens SIMATIC CP 1604. 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-2019-6568/ (Markdown: https://insights.sbomify.com/CVE-2019-6568/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6568
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6568
- OSV: https://osv.dev/vulnerability/CVE-2019-6568

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-6568/
Summaries are generated and may contain mistakes; the official description above is the record.