{"api_version":"1","generated_at":"2026-07-24T01:40:05+00:00","cve":"CVE-2021-22547","urls":{"html":"https://cve.report/CVE-2021-22547","api":"https://cve.report/api/cve/CVE-2021-22547.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-22547","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-22547"},"summary":{"title":"CVE-2021-22547","description":"In IoT Devices SDK, there is an implementation of calloc() that doesn't have a length check. An attacker could pass in memory objects larger than the buffer and wrap around to have a smaller buffer than required, allowing the attacker access to the other parts of the heap. We recommend upgrading the Google Cloud IoT Device SDK for Embedded C used to 1.0.3 or greater.","state":"PUBLIC","assigner":"security@google.com","published_at":"2021-05-04 13:15:00","updated_at":"2021-05-07 22:18:00"},"problem_types":["CWE-120"],"metrics":[],"references":[{"url":"https://github.com/GoogleCloudPlatform/iot-device-sdk-embedded-c/pull/119","name":"N/A","refsource":"CONFIRM","tags":[],"title":"calloc limits by DellaBitta · Pull Request #119 · GoogleCloudPlatform/iot-device-sdk-embedded-c · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/GoogleCloudPlatform/iot-device-sdk-embedded-c/blob/master/RELEASE-NOTES.md","name":"N/A","refsource":"CONFIRM","tags":[],"title":"iot-device-sdk-embedded-c/RELEASE-NOTES.md at master · GoogleCloudPlatform/iot-device-sdk-embedded-c · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-22547","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22547","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"22547","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"google","cpe5":"cloud_iot_device_sdk_for_embedded_c","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"security@google.com","ID":"CVE-2021-22547","STATE":"PUBLIC","TITLE":"Buffer overrun in Google Cloud IoT Device SDK for Embedded C"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Google Cloud IoT Device SDK for Embedded C","version":{"version_data":[{"version_affected":"<=","version_value":"1.0.2"}]}}]},"vendor_name":"Google LLC"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"In IoT Devices SDK, there is an implementation of calloc() that doesn't have a length check. An attacker could pass in memory objects larger than the buffer and wrap around to have a smaller buffer than required, allowing the attacker access to the other parts of the heap. We recommend upgrading the Google Cloud IoT Device SDK for Embedded C used to 1.0.3 or greater."}]},"generator":{"engine":"Vulnogram 0.0.9"},"impact":{"cvss":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":6.3,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-120 Buffer Overflow"}]}]},"references":{"reference_data":[{"refsource":"MISC","url":"https://github.com/GoogleCloudPlatform/iot-device-sdk-embedded-c/blob/master/RELEASE-NOTES.md","name":"https://github.com/GoogleCloudPlatform/iot-device-sdk-embedded-c/blob/master/RELEASE-NOTES.md"},{"refsource":"MISC","url":"https://github.com/GoogleCloudPlatform/iot-device-sdk-embedded-c/pull/119","name":"https://github.com/GoogleCloudPlatform/iot-device-sdk-embedded-c/pull/119"}]},"source":{"discovery":"EXTERNAL"}},"nvd":{"publishedDate":"2021-05-04 13:15:00","lastModifiedDate":"2021-05-07 22:18:00","problem_types":["CWE-120"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:L/AC:L/Au:N/C:P/I:P/A:P","accessVector":"LOCAL","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL","baseScore":4.6},"severity":"MEDIUM","exploitabilityScore":3.9,"impactScore":6.4,"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:a:google:cloud_iot_device_sdk_for_embedded_c:*:*:*:*:*:*:*:*","versionEndExcluding":"1.0.3","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"22547","Ordinal":"197252","Title":"CVE-2021-22547","CVE":"CVE-2021-22547","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"22547","Ordinal":"1","NoteData":"In IoT Devices SDK, there is an implementation of calloc() that doesn't have a length check. An attacker could pass in memory objects larger than the buffer and wrap around to have a smaller buffer than required, allowing the attacker access to the other parts of the heap. We recommend upgrading the Google Cloud IoT Device SDK for Embedded C used to 1.0.3 or greater.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"22547","Ordinal":"2","NoteData":"2021-05-04","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"22547","Ordinal":"3","NoteData":"2021-05-04","Type":"Other","Title":"Modified"}]}}}