{"api_version":"1","generated_at":"2026-04-23T07:56:10+00:00","cve":"CVE-2021-43997","urls":{"html":"https://cve.report/CVE-2021-43997","api":"https://cve.report/api/cve/CVE-2021-43997.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-43997","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-43997"},"summary":{"title":"CVE-2021-43997","description":"FreeRTOS versions 10.2.0 through 10.4.5 do not prevent non-kernel code from calling the xPortRaisePrivilege internal function to raise privilege. FreeRTOS versions through 10.4.6 do not prevent a third party that has already independently gained the ability to execute injected code to achieve further privilege escalation by branching directly inside a FreeRTOS MPU API wrapper function with a manually crafted stack frame. These issues affect ARMv7-M MPU ports, and ARMv8-M ports with MPU support enabled (i.e. configENABLE_MPU set to 1). These are fixed in V10.5.0 and in V10.4.3-LTS Patch 3.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2021-11-17 21:15:00","updated_at":"2022-10-12 00:15:00"},"problem_types":["NVD-CWE-noinfo"],"metrics":[],"references":[{"url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.6","name":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.6","refsource":"MISC","tags":[],"title":"Release V10.4.6 · FreeRTOS/FreeRTOS-Kernel · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.3-LTS-Patch-2","name":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.3-LTS-Patch-2","refsource":"MISC","tags":[],"title":"Release V10.4.3 LTS Patch 2 · FreeRTOS/FreeRTOS-Kernel · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.3-LTS-Patch-3","name":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.3-LTS-Patch-3","refsource":"MISC","tags":[],"title":"Release V10.4.3 LTS Patch 3 · FreeRTOS/FreeRTOS-Kernel · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.5.0","name":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.5.0","refsource":"MISC","tags":[],"title":"Release V10.5.0 · FreeRTOS/FreeRTOS-Kernel · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-43997","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43997","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"43997","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"amazon","cpe5":"freertos","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"-","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"43997","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"amazon","cpe5":"freertos","cpe6":"10.4.3","cpe7":"patch1","cpe8":"*","cpe9":"*","cpe10":"lts","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2021-43997","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"FreeRTOS versions 10.2.0 through 10.4.5 do not prevent non-kernel code from calling the xPortRaisePrivilege internal function to raise privilege. FreeRTOS versions through 10.4.6 do not prevent a third party that has already independently gained the ability to execute injected code to achieve further privilege escalation by branching directly inside a FreeRTOS MPU API wrapper function with a manually crafted stack frame. These issues affect ARMv7-M MPU ports, and ARMv8-M ports with MPU support enabled (i.e. configENABLE_MPU set to 1). These are fixed in V10.5.0 and in V10.4.3-LTS Patch 3."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.3-LTS-Patch-2","refsource":"MISC","name":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.3-LTS-Patch-2"},{"url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.6","refsource":"MISC","name":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.6"},{"refsource":"MISC","name":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.5.0","url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.5.0"},{"refsource":"MISC","name":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.3-LTS-Patch-3","url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.3-LTS-Patch-3"}]}},"nvd":{"publishedDate":"2021-11-17 21:15:00","lastModifiedDate":"2022-10-12 00:15:00","problem_types":["NVD-CWE-noinfo"],"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:C/I:C/A:C","accessVector":"LOCAL","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"COMPLETE","integrityImpact":"COMPLETE","availabilityImpact":"COMPLETE","baseScore":7.2},"severity":"HIGH","exploitabilityScore":3.9,"impactScore":10,"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:amazon:freertos:10.4.3:patch1:*:*:lts:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:amazon:freertos:*:*:*:*:-:*:*:*","versionStartIncluding":"10.2.0","versionEndExcluding":"10.4.6","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"43997","Ordinal":"221624","Title":"CVE-2021-43997","CVE":"CVE-2021-43997","Year":"2021"},"notes":[]}}}