{"id":"CVE-2019-10121","url":"https://www.cyber-defence.io/tools/cve/CVE-2019-10121","generatedAt":"2026-10-28T19:02:21.111Z","title":"An attacker can obtain a session ID via the user authentication dialogue, aka HMCCU-153.","description":"eQ-3 HomeMatic CCU2 devices before 2.41.8 and CCU3 devices before 3.43.15 use session IDs for authentication but lack authorization checks. An attacker can obtain a session ID via the user authentication dialogue, aka HMCCU-153. This leads to automatic login as admin.","published":"2019-07-10T12:15:12.000Z","lastModified":"2026-06-17T02:10:17.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-306"],"affected":["eq-3/ccu3 firmware","eq-3/ccu2 firmware"],"epss":{"score":0.04628,"percentile":0.91659,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.03492,"percentile":0.88623},{"date":"2026-09-22","score":0.04628,"percentile":0.91291}]},"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 (4.63%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://os-s.de/advisories/OSS-2018-01.pdf","tags":["Broken Link"],"source":"cve@mitre.org"},{"url":"https://www.eq-3.de/Downloads/Software/CCU3-Firmware/CCU3-3.43.16/CCU3-Changelog.3.43.16.pdf","tags":["Release Notes","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://www.eq-3.de/Downloads/Software/HM-CCU2-Firmware_Updates/HM-CCU-2.41.9/HM-CCU2-Changelog.2.41.9.pdf","tags":["Release Notes","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://os-s.de/advisories/OSS-2018-01.pdf","tags":["Broken Link"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.eq-3.de/Downloads/Software/CCU3-Firmware/CCU3-3.43.16/CCU3-Changelog.3.43.16.pdf","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.eq-3.de/Downloads/Software/HM-CCU2-Firmware_Updates/HM-CCU-2.41.9/HM-CCU2-Changelog.2.41.9.pdf","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-10121","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."}