Wärtsilä FOS-Onboard (Update A): 2 CVEs, High 8.3
Summary
CISA reports 2 vulnerabilities in Wärtsilä FOS-Onboard. Weakness type: Use of Hard-coded Cryptographic Key. 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. Highest CVSS v3 score: 8.3 (High), exploitable from an adjacent network.
At a glance
- Vendor
- Wärtsilä
- Products
- FOS-Onboard
- CVEs
- CVE-2026-78225, CVE-2026-81855
- Highest CVSS v3
- 8.3 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
- Highest CVSS v4
- –
- Known exploited (KEV)
- No CVE from this advisory is on the KEV list as of the last refresh
- Sectors (per CISA)
- Transportation Systems
- Deployed
- Worldwide
- Vendor HQ
- Finland
Vulnerabilities
| CVE | Weakness | CVSS v3 | CVSS v4 | KEV | Description (from advisory) |
|---|---|---|---|---|---|
| CVE-2026-78225 | Use of Hard-coded Cryptographic Key | 8.3 | – | No | A hardcoded cryptographic server key vulnerability exists in the deployer-ng Update Controller component of Wärtsilä FOS-Onboard. |
| CVE-2026-81855 | Use of Hard-coded Cryptographic Key | 8.3 | – | No | A hardcoded cryptographic client authentication key vulnerability exists in the robot testing framework component of Wärtsilä FOS-Onboard. |
Affected products (1)
- Wärtsilä FOS-Onboard: 5.07.0923.01
Vendor fixes and mitigations (from advisory)
- Mitigation: Wärtsilä states that the vulnerabilities are not exploitable when the product is installed as recommended, and has developed a security patch. The patch (version 5.08.4052.01) can be found on the Wärtsilä FOS download site. Users can also contact Wärtsilä to obtain and install the patch. link
Also apply CISA's standard ICS practices: minimize network exposure, keep control networks behind firewalls and isolated from business networks, and use up-to-date secure remote access.
Sources
This page is generated automatically from the CISA advisory text. It is not a substitute for the vendor's guidance; verify affected versions and fixes at the source before making changes to control systems.