What is CVE-2026-78225?

CVE-2026-78225 is a critical-severity vulnerability in Wärtsilä Fos-Onboard, classified under Use of Hard-coded Cryptographic Key. CVSS score: 9.0/10. Published 2026-09-15.

How severe is CVE-2026-78225?

Critical severity. CVSS v3 base score is 9.0 out of 10.

Vulnerability in Wärtsilä Fos-Onboard

CVE-2026-78225

A hardcoded cryptographic server key vulnerability exists in the deployer-ng Update Controller component of Wärtsilä FOS-Onboard.

Published 2026-09-15 · last modified 2026-09-24.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (43.4th percentile), scored 2026-10-31.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Wärtsilä Fos-Onboard — versions 5.07.0923.01

Weakness classification (CWE)

CWE-321 — Use of Hard-coded Cryptographic Key

References

Frequently asked questions

What is CVE-2026-78225?: CVE-2026-78225 is a critical-severity vulnerability in Wärtsilä Fos-Onboard, classified under Use of Hard-coded Cryptographic Key. CVSS score: 9.0/10. Published 2026-09-15.
How severe is CVE-2026-78225?: Critical severity. CVSS v3 base score is 9.0 out of 10.