# Improper handling of exceptional conditions in Siemens SIMATIC HMI Comfort Outdoor Panels V15 7\\" & 15\\" (incl. SIPLUS… and others

CVE record · `CVE-2021-25662`

- **Identifiers:** `CVE-2021-25662`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **CNA:** siemens
- **Weakness (CWE):** [CWE-755](https://cwe.mitre.org/data/definitions/755.html)
- **Tags:** [CWE-755](https://agentprime.io/advisories/tag/cwe-755.md)
- **Technologies:** [Siemens SIMATIC HMI Comfort Outdoor Panels V15 7\\" & 15\\" (incl. SIPLUS variants)](https://agentprime.io/advisories/technology/siemens-simatic-hmi-comfort-outdoor-panels-v15-7-15-incl-siplus-variants.md) · [Siemens SIMATIC HMI Comfort Outdoor Panels V16 7\\" & 15\\" (incl. SIPLUS variants)](https://agentprime.io/advisories/technology/siemens-simatic-hmi-comfort-outdoor-panels-v16-7-15-incl-siplus-variants.md) · [Siemens SIMATIC HMI Comfort Panels V15 4\\" - 22\\" (incl. SIPLUS variants)](https://agentprime.io/advisories/technology/siemens-simatic-hmi-comfort-panels-v15-4-22-incl-siplus-variants.md) · [Siemens SIMATIC HMI Comfort Panels V16 4\\" - 22\\" (incl. SIPLUS variants)](https://agentprime.io/advisories/technology/siemens-simatic-hmi-comfort-panels-v16-4-22-incl-siplus-variants.md) · [Siemens SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F](https://agentprime.io/advisories/technology/siemens-simatic-hmi-ktp-mobile-panels-v15-ktp400f-ktp700-ktp700f-ktp900-and-ktp9.md) · [Siemens SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F](https://agentprime.io/advisories/technology/siemens-simatic-hmi-ktp-mobile-panels-v16-ktp400f-ktp700-ktp700f-ktp900-and-ktp9.md) · [Siemens SIMATIC WinCC Runtime Advanced V15](https://agentprime.io/advisories/technology/siemens-simatic-wincc-runtime-advanced-v15.md) · [Siemens SIMATIC WinCC Runtime Advanced V16](https://agentprime.io/advisories/technology/siemens-simatic-wincc-runtime-advanced-v16.md)
- **Published:** 12 May 2021
- **Updated:** 2 Jun 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: siemens) at 12 May 2021, 13:18 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.

## Affected products, as the CNA wrote them

- Vendor: Siemens. Product: SIMATIC HMI Comfort Outdoor Panels V15 7\\" & 15\\" (incl. SIPLUS variants).
  - affected: `All versions < V15.1 Update 6`
- Vendor: Siemens. Product: SIMATIC HMI Comfort Outdoor Panels V16 7\\" & 15\\" (incl. SIPLUS variants).
  - affected: `All versions < V16 Update 4`
- Vendor: Siemens. Product: SIMATIC HMI Comfort Panels V15 4\\" - 22\\" (incl. SIPLUS variants).
  - affected: `All versions < V15.1 Update 6`
- Vendor: Siemens. Product: SIMATIC HMI Comfort Panels V16 4\\" - 22\\" (incl. SIPLUS variants).
  - affected: `All versions < V16 Update 4`
- Vendor: Siemens. Product: SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F.
  - affected: `All versions < V15.1 Update 6`
- Vendor: Siemens. Product: SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F.
  - affected: `All versions < V16 Update 4`
- Vendor: Siemens. Product: SIMATIC WinCC Runtime Advanced V15.
  - affected: `All versions < V15.1 Update 6`
- Vendor: Siemens. Product: SIMATIC WinCC Runtime Advanced V16.
  - affected: `All versions < V16 Update 4`

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.017, the 76th 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 12 May 2021. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2021-25662](https://www.cve.org/CVERecord?id=CVE-2021-25662)
- [NVD: CVE-2021-25662](https://nvd.nist.gov/vuln/detail/CVE-2021-25662)

### References from the CNA

- <https://cert-portal.siemens.com/productcert/pdf/ssa-538778.pdf>
- <https://us-cert.cisa.gov/ics/advisories/icsa-21-131-12>

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-2021-25662>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2021-25662/>. Everything for agents: <https://agentprime.io/llms.txt>.