CVE-2026-81855 PUBLISHED

Wärtsilä FOS-Onboard Use of Hard-coded Cryptographic Key

Assigner: icscert
Reserved: 08.09.2026 Published: 15.09.2026 Updated: 16.09.2026

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

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS Score: 9.1

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

CVSS Vector: 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
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Wärtsilä
Product	FOS-Onboard
Versions	Default: unaffected Version 5.07.0923.01 is affected

Solutions

Wärtsilä states that the vulnerabilities are not exploitable when the product is installed as recommended, and has developed a security patch. Users are also directed to contact Wärtsilä to obtain and install the patch. To obtain and install the latest patch, contact Wärtsilä: https://www.wartsila.com/services-catalogue/engine-services-4-stroke/wartsila-ics-patch-deployment#contact

CVE-2026-81855 PUBLISHED

Wärtsilä FOS-Onboard Use of Hard-coded Cryptographic Key

Metrics

Product Status

Solutions

Credits

References

Problem Types