{"id":"CVE-2021-27427","aliases":["EUVD-2021-14181","GHSA-xw8p-6vv6-4c5g"],"status":"published","title":"RIOT OS Integer Overflow or Wraparound","description":"RIOT OS version 2020.01.1 is vulnerable to integer wrap-around in its implementation of calloc function, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.","severity":{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01675,"percentile":0.77174,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-190"],"published":"2022-05-03T20:16:27Z","modified":"2026-06-17T03:44:50Z","products":[{"vendor":"riot","product":"riot os"},{"vendor":"riot os","product":"riot os"},{"vendor":"riot-os","product":"riot"}],"references":[{"url":"https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","US Government Resource"]},{"url":"https://github.com/RIOT-OS/RIOT","tags":["x_refsource_CONFIRM","x_transferred","Product","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27427"},{"url":"https://github.com/advisories/GHSA-xw8p-6vv6-4c5g"}],"sources":{"cve":[{"id":"CVE-2021-27427","title":"RIOT OS Integer Overflow or Wraparound","description":"RIOT OS version 2020.01.1 is vulnerable to integer wrap-around in its implementation of calloc function, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.","status":"published","published":"2022-05-03T20:16:27Z","modified":"2025-04-16T16:25:40.605Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"cna"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T14:33:04.360272Z"}],"euvd":[{"id":"EUVD-2021-14181","description":"RIOT OS version 2020.01.1 is vulnerable to integer wrap-around in its implementation of calloc function, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.","status":"published","published":"2022-05-03T20:16:27Z","modified":"2025-04-16T16:25:40Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T20:52:23.922531Z"}],"ghsa":[{"id":"GHSA-xw8p-6vv6-4c5g","title":"RIOT OS version 2020.01.1 is vulnerable to integer wrap-around in its implementation of calloc...","description":"RIOT OS version 2020.01.1 is vulnerable to integer wrap-around in its implementation of calloc function, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.","status":"published","published":"2022-05-04T00:00:17Z","modified":"2023-02-01T05:01:32Z","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-190"],"updated_at":"2026-11-02T14:49:44.320253Z"}],"nvd":[{"id":"CVE-2021-27427","description":"RIOT OS version 2020.01.1 is vulnerable to integer wrap-around in its implementation of calloc function, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.","status":"published","published":"2022-05-03T21:15:08.433Z","modified":"2026-06-17T03:44:50.41Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"secondary"},{"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":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T14:07:06.029737Z"}]}}