# CVE-2026-78225

Hardcoded cryptographic server key in Wärtsilä FOS‑Onboard update controller

- Page: https://www.vulneraibility.com/cve/CVE-2026-78225
- CVSS: 9.5
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.51% (percentile 43.4)
- CISA SSVC: exploitation none, automatable no, technical impact total (assessed 2026-09-16)
- Weakness: CWE-321
- Published: 2026-09-15

## Affected versions

- Wärtsilä FOS-Onboard: affected 5.07.0923.01

A version outside these ranges is not a statement that it is unaffected.

## Impact

Attacker can impersonate update server, decrypt/forge updates, push malicious firmware leading to remote code execution and device takeover.

## Action

Immediate action required

## Recommendation

Isolate devices, block update/management ports, contact Wärtsilä and apply vendor patch when released

## References

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

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.