{"schemaVersion":3,"id":"CVE-2021-32771","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Contiki-NG is an open-source, cross-platform operating system for IoT devices. In affected versions it is possible to cause a buffer overflow when copying an IPv6 address prefix in the RPL-Classic implementation in Contiki-NG. In order to trigger the vulnerability, the Contiki-NG system must have joined an RPL DODAG. After that, an attacker can send a DAO packet with a Target option that contains a prefix length larger than 128 bits. The problem was fixed after the release of Contiki-NG 4.7. Users unable to upgrade may apply the patch in Contiki-NG PR #1615.","dates":{"published":"2022-08-04T20:25:16.000Z","modified":"2025-04-23T17:53:33.843Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.1,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01353,"percentile":0.71328,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0.06600000000000009,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.01287},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.01353,"percentile":0.71328}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01287,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01315,"percentile":null},{"date":"2026-10-10T00:00:00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