# CVE-2026-81855

## Summary

- **CVE ID:** CVE-2026-81855
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-321
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 16, 2026

## Description

A hardcoded cryptographic client authentication key vulnerability exists in the robot testing framework component of Wärtsilä FOS-Onboard.

## Affected Products

- Wärtsilä — FOS-Onboard (5.07.0923.01)

## References

- [CNA](https://www.wartsila.com/services-catalogue/engine-services-4-stroke/wartsila-ics-patch-deployment#contact)
- [CNA](https://www.cisa.gov/news-events/ics-advisories/icsa-26-258-02)
- [CNA](https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-258-02.json)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.48%
- **EPSS Percentile:** 40.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._