{"id":"CVE-2021-25909","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-25909","generatedAt":"2026-10-27T23:38:45.375Z","title":"ZIV Automation 4CCT-EA6-334126BF firmware version 3.23.80.27.36371, allows an unauthenticated, remote attacker to cause a denial of service condition on the device.","description":"ZIV Automation 4CCT-EA6-334126BF firmware version 3.23.80.27.36371, allows an unauthenticated, remote attacker to cause a denial of service condition on the device. An attacker could exploit this vulnerability by sending specific packets to the port 7919.","published":"2021-01-29T14:15:12.000Z","lastModified":"2026-06-17T03:42:34.000Z","status":"Modified","sourceIdentifier":"cve-coordination@incibe.es","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-400"],"affected":["zivautomation/4cct-ea6-334126bf firmware"],"epss":{"score":0.01315,"percentile":0.70537,"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 (1.31%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://www.incibe-cert.es/en/early-warning/ics-advisories/4cct-vulnerable-denial-service-attack","tags":["Third Party Advisory"],"source":"cve-coordination@incibe.es"},{"url":"https://www.incibe-cert.es/en/early-warning/ics-advisories/4cct-vulnerable-denial-service-attack","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-25909","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."}