Affects Wärtsilä FOS-Onboard OT component used in maritime and power systems; allows update spoofing and device takeover — high-impact to critical infrastructure.
CVE-2026-78225
Hardcoded cryptographic server key in Wärtsilä FOS‑Onboard update controller
Is CVE-2026-78225 being exploited?
Not confirmed. CVE-2026-78225 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.41% probability of exploitation in the next 30 days.
How severe is CVE-2026-78225?
CVE-2026-78225 is rated Critical with a CVSS score of 9.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-78225?
Not known from our data. No patch reference has been recorded for CVE-2026-78225, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-78225 affect?
CVE-2026-78225 affects Wärtsilä FOS-Onboard (deployer-ng Update Controller). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-78225?
Isolate devices, block update/management ports, contact Wärtsilä and apply vendor patch when released
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker can impersonate update server, decrypt/forge updates, push malicious firmware leading to remote code execution and device takeover.
Immediate action required
- affected5.07.0923.01
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.