{"id":"CVE-2021-42141","aliases":["EUVD-2021-29124","GHSA-mfm9-9c5w-7f5g"],"status":"published","title":"An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. One incorrect handshake could...","description":"An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. One incorrect handshake could complete with different epoch numbers in the packets Client_Hello, Client_key_exchange, and Change_cipher_spec, which may cause denial of service.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01181,"percentile":0.67975,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-755"],"published":"2024-01-22T00:00:00Z","modified":"2026-06-17T04:09:25Z","products":[{"vendor":"contiki-ng","product":"tinydtls"}],"references":[{"url":"https://github.com/contiki-ng/tinydtls/issues/27","tags":["x_transferred","Patch"]},{"url":"http://packetstormsecurity.com/files/176625/Contiki-NG-tinyDTLS-Denial-Of-Service.html","tags":["x_transferred","Third Party Advisory","VDB Entry"]},{"url":"https://seclists.org/fulldisclosure/2024/Jan/14","tags":["x_transferred","Mailing List","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2024/Jan/14"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-42141"},{"url":"https://github.com/advisories/GHSA-mfm9-9c5w-7f5g"}],"sources":{"cve":[{"id":"CVE-2021-42141","description":"An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. One incorrect handshake could complete with different epoch numbers in the packets Client_Hello, Client_key_exchange, and Change_cipher_spec, which may cause denial of service.","status":"published","published":"2024-01-22T00:00:00Z","modified":"2025-06-20T18:34:42.81Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-755"],"updated_at":"2026-11-02T14:32:58.739039Z"}],"euvd":[{"id":"EUVD-2021-29124","description":"An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. One incorrect handshake could complete with different epoch numbers in the packets Client_Hello, Client_key_exchange, and Change_cipher_spec, which may cause denial of service.","status":"published","published":"2024-01-22T00:00:00Z","modified":"2025-06-20T18:34:42Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T20:32:18.601981Z"}],"ghsa":[{"id":"GHSA-mfm9-9c5w-7f5g","title":"An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. One incorrect handshake could...","description":"An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. One incorrect handshake could complete with different epoch numbers in the packets Client_Hello, Client_key_exchange, and Change_cipher_spec, which may cause denial of service.","status":"published","published":"2024-01-23T00:30:31Z","modified":"2025-06-20T21:31:47Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-755"],"updated_at":"2026-11-02T15:02:46.844129Z"}],"nvd":[{"id":"CVE-2021-42141","description":"An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. One incorrect handshake could complete with different epoch numbers in the packets Client_Hello, Client_key_exchange, and Change_cipher_spec, which may cause denial of service.","status":"published","published":"2024-01-22T23:15:08.12Z","modified":"2026-06-17T04:09:25.03Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-755"],"updated_at":"2026-11-02T14:07:08.163458Z"}]}}