Hardcoded Cryptographic Key Vulnerability in Wärtsilä FOS-Onboard Framework
CVE-2026-81855

9.3CRITICAL

Key Information:

Vendor

Wärtsilä

Status
Fos-onboard
Vendor
CVE Published:
15 September 2026

What is CVE-2026-81855?

A vulnerability exists in the Wärtsilä FOS-Onboard framework due to a hardcoded cryptographic client authentication key. This presents a significant security risk, as attackers could exploit this weakness to gain unauthorized access. Maintaining robust security measures is essential to mitigate potential threats posed by such vulnerabilities.

Affected Version(s)

FOS-Onboard 5.07.0923.01

References

https://www.wartsila.com/services-catalogue/engine-servic...
https://www.cisa.gov/news-events/ics-advisories/icsa-26-2...
https://github.com/cisagov/CSAF/blob/develop/csaf_files/O...

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Cydome Security Ltd reported this vulnerability to Wärtsilä and CISA.
.