# Missing authentication in Siemens SIMATIC HMI Comfort Panels (incl. SIPLUS variants) and others

CVE record · `CVE-2020-15798`

- **Identifiers:** `CVE-2020-15798`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** siemens
- **Weakness (CWE):** [CWE-306](https://cwe.mitre.org/data/definitions/306.html)
- **Tags:** [Authentication bypass](https://agentprime.io/advisories/tag/auth-bypass.md)
- **Technologies:** [Siemens SIMATIC HMI Comfort Panels (incl. SIPLUS variants)](https://agentprime.io/advisories/technology/siemens-simatic-hmi-comfort-panels-incl-siplus-variants.md) · [Siemens SIMATIC HMI KTP Mobile Panels](https://agentprime.io/advisories/technology/siemens-simatic-hmi-ktp-mobile-panels.md) · [Siemens SINAMICS GH150](https://agentprime.io/advisories/technology/siemens-sinamics-gh150.md) · [Siemens SINAMICS GL150 (with option X30)](https://agentprime.io/advisories/technology/siemens-sinamics-gl150-with-option-x30.md) · [Siemens SINAMICS GM150 (with option X30)](https://agentprime.io/advisories/technology/siemens-sinamics-gm150-with-option-x30.md) · [Siemens SINAMICS SH150](https://agentprime.io/advisories/technology/siemens-sinamics-sh150.md) · [Siemens SINAMICS SL150](https://agentprime.io/advisories/technology/siemens-sinamics-sl150.md) · [Siemens SINAMICS SM120](https://agentprime.io/advisories/technology/siemens-sinamics-sm120.md) · [Siemens SINAMICS SM150](https://agentprime.io/advisories/technology/siemens-sinamics-sm150.md) · [Siemens SINAMICS SM150i](https://agentprime.io/advisories/technology/siemens-sinamics-sm150i.md)
- **Published:** 9 Feb 2021
- **Updated:** 2 Jun 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: siemens) at 9 Feb 2021, 15:38 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Siemens. Product: SIMATIC HMI Comfort Panels (incl. SIPLUS variants).
  - affected: `All versions < V16 Update 3a`
- Vendor: Siemens. Product: SIMATIC HMI KTP Mobile Panels.
  - affected: `All versions < V16 Update 3a`
- Vendor: Siemens. Product: SINAMICS GH150.
  - affected: `All versions`
- Vendor: Siemens. Product: SINAMICS GL150 (with option X30).
  - affected: `All versions`
- Vendor: Siemens. Product: SINAMICS GM150 (with option X30).
  - affected: `All versions`
- Vendor: Siemens. Product: SINAMICS SH150.
  - affected: `All versions`
- Vendor: Siemens. Product: SINAMICS SL150.
  - affected: `All versions`
- Vendor: Siemens. Product: SINAMICS SM120.
  - affected: `All versions`
- Vendor: Siemens. Product: SINAMICS SM150.
  - affected: `All versions`
- Vendor: Siemens. Product: SINAMICS SM150i.
  - affected: `All versions`

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 9.8 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`, from ADP (CISA-ADP)

- **CISA KEV:** Not listed.
- **EPSS:** 0.053, the 92nd percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 9 Feb 2021. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2020-15798](https://www.cve.org/CVERecord?id=CVE-2020-15798)
- [NVD: CVE-2020-15798](https://nvd.nist.gov/vuln/detail/CVE-2020-15798)

### References from the CNA

- <https://cert-portal.siemens.com/productcert/pdf/ssa-520004.pdf>
- <https://us-cert.cisa.gov/ics/advisories/icsa-21-033-02>
- <https://cert-portal.siemens.com/productcert/pdf/ssa-752103.pdf> (confirm)

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2020-15798>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2020-15798/>. Everything for agents: <https://agentprime.io/llms.txt>.