🔐 CVE Alert

CVE-2026-81855

CRITICAL 9.1

Wärtsilä FOS-Onboard Use of Hard-coded Cryptographic Key

CVSS Score
9.1
EPSS Score
0.0%
EPSS Percentile
0th

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

CWE CWE-321
Vendor wärtsilä
Product fos-onboard
Published Sep 15, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Affected Versions

Wärtsilä / FOS-Onboard
5.07.0923.01

References

NVD ↗ CVE.org ↗ EPSS Data ↗
wartsila.com: https://www.wartsila.com/services-catalogue/engine-services-4-stroke/wartsila-ics-patch-deployment#contact cisa.gov: https://www.cisa.gov/news-events/ics-advisories/icsa-26-258-02 github.com: https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-258-02.json

Credits

Cydome Security Ltd reported this vulnerability to Wärtsilä and CISA.