# Buffer overflow in Siemens SIMATIC Drive Controller family and others

CVE record · `CVE-2020-15782`

- **Identifiers:** `CVE-2020-15782`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** siemens
- **Weakness (CWE):** [CWE-119](https://cwe.mitre.org/data/definitions/119.html)
- **Tags:** [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md)
- **Technologies:** [Siemens SIMATIC Drive Controller family](https://agentprime.io/advisories/technology/siemens-simatic-drive-controller-family.md) · [Siemens SIMATIC ET 200SP Open Controller CPU 1515SP PC (incl. SIPLUS variants)](https://agentprime.io/advisories/technology/siemens-simatic-et-200sp-open-controller-cpu-1515sp-pc-incl-siplus-variants.md) · [Siemens SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants)](https://agentprime.io/advisories/technology/siemens-simatic-et-200sp-open-controller-cpu-1515sp-pc2-incl-siplus-variants.md) · [Siemens SIMATIC S7-1200 CPU family (incl. SIPLUS variants)](https://agentprime.io/advisories/technology/siemens-simatic-s7-1200-cpu-family-incl-siplus-variants.md) · [Siemens SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants)](https://agentprime.io/advisories/technology/siemens-simatic-s7-1500-cpu-family-incl-related-et200-cpus-and-siplus-variants.md) · [Siemens SIMATIC S7-1500 Software Controller](https://agentprime.io/advisories/technology/siemens-simatic-s7-1500-software-controller.md) · [Siemens SIMATIC S7-PLCSIM Advanced](https://agentprime.io/advisories/technology/siemens-simatic-s7-plcsim-advanced.md) · [Siemens SINAMICS PERFECT HARMONY GH180 Drives](https://agentprime.io/advisories/technology/siemens-sinamics-perfect-harmony-gh180-drives.md) · [Siemens SINUMERIK MC](https://agentprime.io/advisories/technology/siemens-sinumerik-mc.md) · [Siemens SINUMERIK ONE](https://agentprime.io/advisories/technology/siemens-sinumerik-one.md)
- **Published:** 28 May 2021
- **Updated:** 2 Jun 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: siemens) at 28 May 2021, 16:10 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 Drive Controller family.
  - affected: `All versions < V2.9.2`
- Vendor: Siemens. Product: SIMATIC ET 200SP Open Controller CPU 1515SP PC (incl. SIPLUS variants).
  - affected: `All versions`
- Vendor: Siemens. Product: SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants).
  - affected: `All versions < V21.9`
- Vendor: Siemens. Product: SIMATIC S7-1200 CPU family (incl. SIPLUS variants).
  - affected: `All versions < V4.5.0`
- Vendor: Siemens. Product: SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants).
  - affected: `All versions < V2.9.2`
- Vendor: Siemens. Product: SIMATIC S7-1500 Software Controller.
  - affected: `All versions < V21.9`
- Vendor: Siemens. Product: SIMATIC S7-PLCSIM Advanced.
  - affected: `All versions < V4.0`
- Vendor: Siemens. Product: SINAMICS PERFECT HARMONY GH180 Drives.
  - affected: `Drives manufactured before 2021-08-13`
- Vendor: Siemens. Product: SINUMERIK MC.
  - affected: `All versions < V6.15`
- Vendor: Siemens. Product: SINUMERIK ONE.
  - affected: `All versions < V6.15`

## 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:** 0.052, the 92nd percentile, on 5 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 28 May 2021. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2020-15782](https://www.cve.org/CVERecord?id=CVE-2020-15782)
- [NVD: CVE-2020-15782](https://nvd.nist.gov/vuln/detail/CVE-2020-15782)

### References from the CNA

- <https://cert-portal.siemens.com/productcert/pdf/ssa-434534.pdf>
- <https://cert-portal.siemens.com/productcert/pdf/ssa-434536.pdf>
- <https://cert-portal.siemens.com/productcert/pdf/ssa-434535.pdf>

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-2020-15782>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2020-15782/>. Everything for agents: <https://agentprime.io/llms.txt>.