# CVE-2019-6576: Weak cryptography in SIMATIC HMI Classic Devices (TP/MP/OP/MP Mobile Panel)

> An attacker with network access can obtain TLS session keys to decrypt traffic, compromising communication confidentiality in Siemens HMI devices.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 May 2019
- **Updated:** 2 Jun 2026
- **Also known as:** GHSA-6vg7-p7hj-4575

## What is CVE-2019-6576?

CVE-2019-6576 is a medium-severity vulnerability in Siemens AG SIMATIC HMI Classic Devices (TP/MP/OP/MP Mobile Panel), published on 14 May 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability has been identified in SIMATIC HMI Comfort Panels 4" - 22" (All versions < V15.1 Update 1), SIMATIC HMI Comfort Outdoor Panels 7" & 15" (All versions < V15.1 Update 1), SIMATIC HMI KTP Mobile Panels KTP400F, KTP700, KTP700F, KTP900 und KTP900F (All versions < V15.1 Update 1), SIMATIC WinCC Runtime Advanced (All versions < V15.1 Update 1), SIMATIC WinCC Runtime Professional (All versions < V15.1 Update 1), SIMATIC WinCC (TIA Portal) (All versions < V15.1 Update 1), SIMATIC HMI Classic Devices (TP/MP/OP/MP Mobile Panel) (All versions). An attacker with network access to affected devices could potentially obtain a TLS session key. If the attacker is able to observe TLS traffic between a legitimate user and the device, then the attacker could decrypt the TLS traffic. The security vulnerability could be exploited by an attacker who has network access to the web interface of the device and who is able to observe TLS traffic between legitimate users and the web interface of the affected device. The vulnerability could impact the confidentiality of the communication between the affected device and a legitimate user. At the time of advisory publication no public exploitation of the security vulnerability was known.

Weakness: CWE-310

## Which versions are affected by CVE-2019-6576?

It affects 12 products.


Products: 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 Hmi Mp Firmware, Siemens Simatic Hmi Op Firmware, Siemens Simatic Hmi Tp Firmware, Siemens Simatic Wincc \(Tia Portal\), Siemens Simatic Wincc Runtime.

## How do I fix CVE-2019-6576?

No fix has been published for CVE-2019-6576 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-6576 being exploited?

There is no known exploitation of CVE-2019-6576 in the wild and no public exploit code.

## Other vulnerabilities in Siemens AG SIMATIC HMI Classic Devices (TP/MP/OP/MP Mobile Panel)

- [CVE-2019-6572](https://insights.sbomify.com/CVE-2019-6572/): Hardcoded credentials in SIMATIC HMI Classic Devices (TP/MP/OP/MP Mobile Panel) (critical 9.1)
- [CVE-2018-13814](https://insights.sbomify.com/CVE-2018-13814/): Other in SIMATIC HMI Comfort Panels 4" - 22", SIMATIC HMI Comfort Outdoor Panels 7" & 15", SIMATIC HMI KTP Mobile Panels KTP400F, KTP700, KTP700F, KTP900 und KTP900F, SIMATIC WinCC Runtime Advanced, SIMATIC WinCC Runtime Professional, SIMATIC WinCC (TIA Portal), SIMATIC HMI Classic Devices (TP/MP/OP/MP Mobile Panel) (high 8.8)
- [CVE-2018-13813](https://insights.sbomify.com/CVE-2018-13813/): Open redirect in SIMATIC HMI Comfort Panels 4" - 22", SIMATIC HMI Comfort Outdoor Panels 7" & 15", SIMATIC HMI KTP Mobile Panels KTP400F, KTP700, KTP700F, KTP900 und KTP900F, SIMATIC WinCC Runtime Advanced, SIMATIC WinCC Runtime Professional, SIMATIC WinCC (TIA Portal), SIMATIC HMI Classic Devices (TP/MP/OP/MP Mobile Panel) (high 8.1)
- [CVE-2018-13812](https://insights.sbomify.com/CVE-2018-13812/): Path traversal in SIMATIC HMI Comfort Panels 4" - 22", SIMATIC HMI Comfort Outdoor Panels 7" & 15", SIMATIC HMI KTP Mobile Panels KTP400F, KTP700, KTP700F, KTP900 und KTP900F, SIMATIC WinCC Runtime Advanced, SIMATIC WinCC Runtime Professional, SIMATIC WinCC (TIA Portal), SIMATIC HMI Classic Devices (TP/MP/OP/MP Mobile Panel) (high 7.5)
- [CVE-2019-6577](https://insights.sbomify.com/CVE-2019-6577/): Cross-site scripting in SIMATIC HMI Classic Devices (TP/MP/OP/MP Mobile Panel) (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-6576 and fix it if it is affected.

What it is: CVE-2019-6576 is a medium-severity vulnerability in Siemens AG SIMATIC HMI Classic Devices (TP/MP/OP/MP Mobile Panel), published on 14 May 2019. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-6576 in the wild and no public exploit code.

Affected product: Siemens AG SIMATIC HMI Classic Devices (TP/MP/OP/MP Mobile Panel). 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-2019-6576/ (Markdown: https://insights.sbomify.com/CVE-2019-6576/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6576
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6576
- OSV: https://osv.dev/vulnerability/CVE-2019-6576

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-6576/
Summaries are generated and may contain mistakes; the official description above is the record.