{"id":"CVE-2021-31399","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-31399","generatedAt":"2026-10-27T20:20:17.172Z","title":"On 2N Access Unit 2.0 2.31.0.40.5 devices, an attacker can pose as the web relay for a man-in-the-middle attack.","description":"On 2N Access Unit 2.0 2.31.0.40.5 devices, an attacker can pose as the web relay for a man-in-the-middle attack.","published":"2021-08-13T13:15:08.000Z","lastModified":"2026-06-17T03:51:42.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"},"cwe":["CWE-295"],"affected":["2n/access unit 2.0 firmware"],"epss":{"score":0.00846,"percentile":0.57798,"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":"low","text":"Lower severity and a low EPSS score (0.85%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://cds.thalesgroup.com/en/tcs-cert/CVE-2021-31399","source":"cve@mitre.org"},{"url":"https://excellium-services.com/cert-xlm-advisory/cve-2021-31399/","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.2n.cz/en_GB/products/ip-access-control/2n-access-unit-2","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://excellium-services.com/cert-xlm-advisory/cve-2021-31399/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.2n.cz/en_GB/products/ip-access-control/2n-access-unit-2","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-31399","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."}