{"id":"CVE-2026-81855","state":"PUBLISHED","title":"Wärtsilä FOS-Onboard Use of Hard-coded Cryptographic Key","description":"A hardcoded cryptographic client authentication key vulnerability exists in the robot testing framework component of Wärtsilä FOS-Onboard.","publishedAt":"2026-09-15T21:31:59.632Z","updatedAt":"2026-09-24T21:36:18.365Z","severity":{"score":9.3,"label":"Critical","version":"4.0","vector":"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","source":"icscert"},"assigner":"icscert","products":["Wärtsilä FOS-Onboard"],"affected":[{"vendor":"Wärtsilä","product":"FOS-Onboard","defaultStatus":"unaffected","versions":[{"version":"5.07.0923.01","status":"affected"},{"version":"5.08.4052.01","status":"unaffected"}]}],"references":["https://www.wartsila.com/marine/products/data-service-downloads/fos-downloads","https://www.cisa.gov/news-events/ics-advisories/icsa-26-258-02","https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-258-02.json"],"weaknesses":["CWE-321"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/81xxx/CVE-2026-81855.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-81855","state":"PUBLISHED","datePublished":"2026-09-15T21:31:59.632Z","dateUpdated":"2026-09-24T21:36:18.365Z","assignerShortName":"icscert","assignerOrgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","dateReserved":"2026-09-08T16:53:35.719Z"},"containers":{"cna":{"title":"Wärtsilä FOS-Onboard Use of Hard-coded Cryptographic Key","descriptions":[{"lang":"en","value":"A hardcoded cryptographic client authentication key vulnerability exists in the robot testing framework component of Wärtsilä FOS-Onboard."}],"affected":[{"vendor":"Wärtsilä","product":"FOS-Onboard","defaultStatus":"unaffected","versions":[{"version":"5.07.0923.01","status":"affected"},{"version":"5.08.4052.01","status":"unaffected"}]}],"references":[{"url":"https://www.wartsila.com/marine/products/data-service-downloads/fos-downloads"},{"url":"https://www.cisa.gov/news-events/ics-advisories/icsa-26-258-02"},{"url":"https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-258-02.json"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE","baseSeverity":"CRITICAL","baseScore":9.1,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"CRITICAL","baseScore":9.3,"vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-321","lang":"en","description":"CWE-321","type":"CWE"}]}],"providerMetadata":{"shortName":"icscert","orgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","dateUpdated":"2026-09-24T21:36:18.365Z"},"solutions":[{"lang":"en","value":"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 https://www.wartsila.com/marine/products/data-service-downloads/fos-downloads . Users can also  contact Wärtsilä https://www.wartsila.com/services-catalogue/engine-services-4-stroke/wartsila-ics-patch-deployment#contact  to obtain and install the patch.","supportingMedia":[{"type":"text/html","base64":false,"value":"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 <a href=\"https://www.wartsila.com/marine/products/data-service-downloads/fos-downloads\">Wärtsilä FOS download site</a>. Users can also <a href=\"https://www.wartsila.com/services-catalogue/engine-services-4-stroke/wartsila-ics-patch-deployment#contact\">contact Wärtsilä</a> to obtain and install the patch."}]}],"credits":[{"lang":"en","value":"Cydome Security Ltd reported this vulnerability to Wärtsilä and CISA.","type":"finder"}],"source":{"advisory":"ICSA-26-258-02","discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-16T18:05:39.334843Z","id":"CVE-2026-81855","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-16T18:05:49.891Z"}}]}}}