{"id":"CVE-2023-5909","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-5909","generatedAt":"2026-10-28T01:10:04.815Z","title":"KEPServerEX does not properly validate certificates from clients which may allow unauthenticated users to connect.","description":"\n\n\n\n\n\n\n\n\nKEPServerEX does not properly validate certificates from clients which may allow unauthenticated users to connect.\n\n\n\n\n\n\n\n","published":"2023-11-30T22:15:10.000Z","lastModified":"2026-06-17T06:49:38.000Z","status":"Modified","sourceIdentifier":"ics-cert@hq.dhs.gov","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"cwe":["CWE-297","CWE-295"],"affected":["ge/industrial gateway server","ptc/keepserverex","ptc/opc-aggregator","ptc/thingworx industrial connectivity","ptc/thingworx kepware edge","ptc/thingworx kepware server","rockwellautomation/kepserver enterprise","softwaretoolbox/top server"],"epss":{"score":0.00438,"percentile":0.37821,"date":"2026-10-26","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 (0.44%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://www.cisa.gov/news-events/ics-advisories/icsa-23-334-03","tags":["Third Party Advisory","US Government Resource"],"source":"ics-cert@hq.dhs.gov"},{"url":"https://www.cisa.gov/news-events/ics-advisories/icsa-23-334-03","tags":["Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-5909","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."}