Wärtsilä FOS-Onboard
CISA advisory: two hardcoded cryptographic key flaws in Wärtsilä FOS-Onboard 5.07.0923.01 (CVSS 9.0/9.1) could allow unauthorized updates, code execution, and credential theft.
CISA advisory ICSA-26-258-02 discloses CVE-2026-78225 (CVSS 3.1 9.0 critical), a hardcoded cryptographic server key in the deployer-ng Update Controller of Wärtsilä FOS-Onboard 5.07.0923.01. CVE-2026-81855 (CVSS 3.1 9.1 critical) is a hardcoded client authentication key in the robot testing framework component. Successful exploitation could let an attacker deliver unauthorized updates, execute code, or extract credentials to impersonate a privileged client. The product is deployed worldwide in transportation systems critical infrastructure; Cydome Security reported the flaws and CISA states no known public exploitation exists.
- CVE-2026-78225: hardcoded server key in deployer-ng Update Controller, CVSS 9.0
- CVE-2026-81855: hardcoded client auth key in robot testing framework, CVSS 9.1
- Exploitation enables unauthorized updates, code execution, privileged impersonation
- Affects transportation systems infrastructure; no known exploitation reported
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2026-78225 | NVD description · AI analysis pending | — | — | — | — | — | |
| CVE-2026-81855 | NVD description · AI analysis pending | — | — | — | — | — |
Full article531 words · extracted from cisa.gov · click to collapse
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
CVE-2026-78225
A hardcoded cryptographic server key vulnerability exists in the deployer-ng Update Controller component of Wärtsilä FOS-Onboard.
Affected Products
Wärtsilä FOS-Onboard
Vendor:
Wärtsilä
Product Version:
Wärtsilä FOS-Onboard: 5.07.0923.01
Product Status:
known_affected
Relevant CWE: CWE-321 Use of Hard-coded Cryptographic Key
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
|---|---|---|---|
| 3.1 | 9 | CRITICAL | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
| 4.0 | 9.5 | CRITICAL | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
CVE-2026-81855
A hardcoded cryptographic client authentication key vulnerability exists in the robot testing framework component of Wärtsilä FOS-Onboard.
Affected Products
Wärtsilä FOS-Onboard
Vendor:
Wärtsilä
Product Version:
Wärtsilä FOS-Onboard: 5.07.0923.01
Product Status:
known_affected
Relevant CWE: CWE-321 Use of Hard-coded Cryptographic Key
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
|---|---|---|---|
| 3.1 | 9.1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| 4.0 | 9.3 | CRITICAL | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
Acknowledgments
- Cydome Security Ltd reported these vulnerabilities to Wärtsilä and CISA
Legal Notice and Terms of Use
This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).
Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities.
- Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
- Locate control system networks and remote devices behind firewalls and isolating them from business networks.
- When remote access is required, use more secure methods, such as virtual private networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:
- Do not click web links or open attachments in unsolicited email messages.
- Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
- Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.
No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.
Revision History
- Initial Release Date: 2026-09-15
| Date | Revision | Summary |
|---|---|---|
| 2026-09-15 | 1 | Initial Publication |
Legal Notice and Terms of Use
Text extracted automatically; images, tables and formatting may be missing. Original: https://www.cisa.gov/news-events/ics-advisories/icsa-26-258-02