{"id":"CVE-2021-42144","aliases":["EUVD-2021-29127","GHSA-7r27-33fg-9cpx"],"status":"published","title":"Buffer over-read vulnerability in Contiki-NG tinyDTLS through master branch 53a0d97 allows...","description":"Buffer over-read vulnerability in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers obtain sensitive information via crafted input to dtls_ccm_decrypt_message().","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":"2026-11-11","score":0.00658,"percentile":0.51939,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-125"],"published":"2024-01-24T00:00:00Z","modified":"2026-06-17T04:09:25Z","products":[{"vendor":"contiki-ng","product":"contiki-ng_tinydtls"}],"references":[{"url":"https://seclists.org/fulldisclosure/2024/Jan/17","tags":["x_transferred","Mailing List","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2024/Jan/17"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-42144"},{"url":"https://github.com/advisories/GHSA-7r27-33fg-9cpx"}],"sources":{"cve":[{"id":"CVE-2021-42144","description":"Buffer over-read vulnerability in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers obtain sensitive information via crafted input to dtls_ccm_decrypt_message().","status":"published","published":"2024-01-24T00:00:00Z","modified":"2025-06-20T19:16:51.596Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"adp"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:32:58.739039Z"}],"euvd":[{"id":"EUVD-2021-29127","description":"Buffer over-read vulnerability in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers obtain sensitive information via crafted input to dtls_ccm_decrypt_message().","status":"published","published":"2024-01-24T00:00:00Z","modified":"2025-06-20T19:16:51Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T20:32:18.601981Z"}],"ghsa":[{"id":"GHSA-7r27-33fg-9cpx","title":"Buffer over-read vulnerability in Contiki-NG tinyDTLS through master branch 53a0d97 allows...","description":"Buffer over-read vulnerability in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers obtain sensitive information via crafted input to dtls_ccm_decrypt_message().","status":"published","published":"2024-01-24T18:31:01Z","modified":"2025-06-20T21:32:59Z","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-125"],"updated_at":"2026-11-02T15:02:47.356918Z"}],"nvd":[{"id":"CVE-2021-42144","description":"Buffer over-read vulnerability in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers obtain sensitive information via crafted input to dtls_ccm_decrypt_message().","status":"published","published":"2024-01-24T18:15:08.15Z","modified":"2026-06-17T04:09:25.56Z","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:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:07:08.163458Z"}]}}