What’s Vulnerable › Vulnerabilities

CVE-2026-81855: Wärtsilä FOS-Onboard Use of Hard-coded Cryptographic Key

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-24
• Weakness: CWE-321

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

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

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