Critical severity · published Sep 15, 2026
CVE-2026-78225
Wärtsilä FOS-Onboard Use of Hard-coded Cryptographic Key
9.0
CVSS
0.5%
EPSS
No
On KEV
Description
A hardcoded cryptographic server key vulnerability exists in the deployer-ng Update Controller component of Wärtsilä FOS-Onboard.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
FOS-Onboard · Wärtsilä
5.07.0923.01 · source: vendor
In the news
VulnerabilityCritical
Wärtsilä FOS-Onboard
View CSAF Summary Successful exploitation of these vulnerabilities could allow an attacker to deliver an unauthorized update, execute code, or extract credentials to allow the attacker to impersonate a privileged client. The following versions of Wärtsilä FOS-Onboard are affected: FOS-Onboard 5.07.0923.01 (CVE-2026-78225, CVE-2026-81855) CVSS Vendor Equipment Vulnerabilities v3 9.1 Wärtsilä Wärtsilä FOS-Onboard Use of Hard-coded Cryptographic Key Background Critical Infrastructure Sectors: Transportation Systems Countries/Areas Deployed: Worldwide Company Headquarters Location: Finland Vulnerabilities Expand All + CVE-2026-78225 A hardcoded cryptographic server key vulnerability exists in the deployer-ng Update Controller component of Wärtsilä FOS-Onboard. View CVE Details Affected Products Wärtsilä FOS-Onboard Vendor: Wärtsilä Product Version: Wärtsilä FOS-Onboard: 5.07.0923.01 Product Status: known_affected Remediations Mitigation Wärtsilä states that the vulnerabilities are not exploitable when the product is installed as recommended, and has developed a security patch. Users are also directed to contact Wärtsilä to obtain and install the patch. To obtain and install the latest patch, contact Wärtsilä:  https://www.wartsila.com/services-catalogue/engine-services-4-stroke/wartsila-ics-patch-deployment#contact Relevant CWE: CWE-321 Use...
Sep 15, 2026·CISA Advisories