{"id":"CVE-2017-9938","url":"https://www.cyber-defence.io/tools/cve/CVE-2017-9938","generatedAt":"2026-10-28T20:08:08.885Z","title":"A vulnerability was discovered in Siemens SIMATIC Logon (All versions before V1.6) that could allow specially crafted packets sent to the SIMATIC Logon Remote Access service on port 16389/tcp to cause a Denial-of-Service condition.","description":"A vulnerability was discovered in Siemens SIMATIC Logon (All versions before V1.6) that could allow specially crafted packets sent to the SIMATIC Logon Remote Access service on port 16389/tcp to cause a Denial-of-Service condition. The service restarts automatically.","published":"2017-08-08T00:29:00.000Z","lastModified":"2026-06-17T01:29:15.000Z","status":"Modified","sourceIdentifier":"productcert@siemens.com","cvss":{"version":"3.0","score":7.5,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-787","CWE-20"],"affected":["siemens/simatic logon"],"epss":{"score":0.02897,"percentile":0.86861,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.90%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://www.securityfocus.com/bid/99539","tags":["Third Party Advisory","VDB Entry"],"source":"productcert@siemens.com"},{"url":"https://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-804859.pdf","tags":["Vendor Advisory"],"source":"productcert@siemens.com"},{"url":"https://www.tenable.com/security/research/tra-2017-34","source":"productcert@siemens.com"},{"url":"http://www.securityfocus.com/bid/99539","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-804859.pdf","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.tenable.com/security/research/tra-2017-34","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2017-9938","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}