CVE-2026-81855

Wärtsilä FOS-Onboard Use of Hard-coded Cryptographic Key

State: Published
Severity: 9.3 Critical
Published: Sep 15, 2026
Updated: Sep 24, 2026
Reserved: Sep 8, 2026

Description

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

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	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	icscert
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N	icscert

Weaknesses

CWE-321

Affected Products

Product	Versions
FOS-OnboardWärtsilä	5.07.0923.01Affected 5.08.4052.01Not affected

References

https://www.wartsila.com/marine/products/data-service-downloads/fos-downloads
https://www.cisa.gov/news-events/ics-advisories/icsa-26-258-02
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-258-02.json

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