{"id":"CVE-2021-42147","aliases":["EUVD-2021-29130","GHSA-9vpc-ch84-fc8h"],"status":"published","title":"Buffer over-read vulnerability in the dtls_sha256_update function in Contiki-NG tinyDTLS through...","description":"Buffer over-read vulnerability in the dtls_sha256_update function in Contiki-NG tinyDTLS through master branch 53a0d97 allows remote attackers to cause a denial of service via crafted data packet.","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00836,"percentile":0.57999,"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":"2026-06-17T04:09:26Z","products":[{"vendor":"contiki-ng","product":"tinydtls"}],"references":[{"url":"https://seclists.org/fulldisclosure/2024/Jan/20","tags":["x_transferred","Mailing List","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2024/Jan/20"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-42147"},{"url":"https://github.com/advisories/GHSA-9vpc-ch84-fc8h"}],"sources":{"cve":[{"id":"CVE-2021-42147","description":"Buffer over-read vulnerability in the dtls_sha256_update function in Contiki-NG tinyDTLS through master branch 53a0d97 allows remote attackers to cause a denial of service via crafted data packet.","status":"published","published":"2024-01-24T00:00:00Z","modified":"2025-05-30T14:17:01.233Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical","assessor":"adp"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:32:58.739039Z"}],"euvd":[{"id":"EUVD-2021-29130","description":"Buffer over-read vulnerability in the dtls_sha256_update function in Contiki-NG tinyDTLS through master branch 53a0d97 allows remote attackers to cause a denial of service via crafted data packet.","status":"published","published":"2024-01-24T00:00:00Z","modified":"2025-05-30T14:17:01Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical"}],"updated_at":"2026-11-02T20:32:34.547192Z"}],"ghsa":[{"id":"GHSA-9vpc-ch84-fc8h","title":"Buffer over-read vulnerability in the dtls_sha256_update function in Contiki-NG tinyDTLS through...","description":"Buffer over-read vulnerability in the dtls_sha256_update function in Contiki-NG tinyDTLS through master branch 53a0d97 allows remote attackers to cause a denial of service via crafted data packet.","status":"published","published":"2024-01-24T21:30:33Z","modified":"2025-05-30T15:30:27Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T15:02:30.830782Z"}],"nvd":[{"id":"CVE-2021-42147","description":"Buffer over-read vulnerability in the dtls_sha256_update function in Contiki-NG tinyDTLS through master branch 53a0d97 allows remote attackers to cause a denial of service via crafted data packet.","status":"published","published":"2024-01-24T19:15:08.53Z","modified":"2026-06-17T04:09:26.083Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical","assessor":"primary"},{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:07:08.163458Z"}]}}