{"api_version":"1","generated_at":"2026-07-23T21:42:47+00:00","cve":"CVE-2021-21410","urls":{"html":"https://cve.report/CVE-2021-21410","api":"https://cve.report/api/cve/CVE-2021-21410.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-21410","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-21410"},"summary":{"title":"CVE-2021-21410","description":"Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An out-of-bounds read can be triggered by 6LoWPAN packets sent to devices running Contiki-NG 4.6 and prior. The IPv6 header decompression function (<code>uncompress_hdr_iphc</code>) does not perform proper boundary checks when reading from the packet buffer. Hence, it is possible to construct a compressed 6LoWPAN packet that will read more bytes than what is available from the packet buffer. As of time of publication, there is not a release with a patch available. 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Users can apply the patch for this vulnerability out-of-band as a workaround."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-125: Out-of-bounds Read"}]}]},"references":{"reference_data":[{"name":"https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-hhwj-2p59-v8p9","refsource":"CONFIRM","url":"https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-hhwj-2p59-v8p9"},{"name":"https://github.com/contiki-ng/contiki-ng/pull/1482","refsource":"MISC","url":"https://github.com/contiki-ng/contiki-ng/pull/1482"}]},"source":{"advisory":"GHSA-hhwj-2p59-v8p9","discovery":"UNKNOWN"}},"nvd":{"publishedDate":"2021-06-18 21:15:00","lastModifiedDate":"2021-06-24 19:27:00","problem_types":["CWE-125"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL"},"exploitabilityScore":3.9,"impactScore":5.2},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:P/I:N/A:P","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"NONE","availabilityImpact":"PARTIAL","baseScore":6.4},"severity":"MEDIUM","exploitabilityScore":10,"impactScore":4.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:contiki-ng:contiki-ng:*:*:*:*:*:*:*:*","versionEndIncluding":"4.6","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"21410","Ordinal":"195536","Title":"CVE-2021-21410","CVE":"CVE-2021-21410","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"21410","Ordinal":"1","NoteData":"Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An out-of-bounds read can be triggered by 6LoWPAN packets sent to devices running Contiki-NG 4.6 and prior. The IPv6 header decompression function (<code>uncompress_hdr_iphc</code>) does not perform proper boundary checks when reading from the packet buffer. Hence, it is possible to construct a compressed 6LoWPAN packet that will read more bytes than what is available from the packet buffer. As of time of publication, there is not a release with a patch available. Users can apply the patch for this vulnerability out-of-band as a workaround.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"21410","Ordinal":"2","NoteData":"2021-06-18","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"21410","Ordinal":"3","NoteData":"2021-06-18","Type":"Other","Title":"Modified"}]}}}