{"api_version":"1","generated_at":"2026-04-20T20:55:06+00:00","cve":"CVE-2020-12887","urls":{"html":"https://cve.report/CVE-2020-12887","api":"https://cve.report/api/cve/CVE-2020-12887.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2020-12887","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-12887"},"summary":{"title":"CVE-2020-12887","description":"Memory leaks were discovered in the CoAP library in Arm Mbed OS 5.15.3 when using the Arm mbed-coap library 5.1.5. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse() parses the CoAP option number field of all options present in the input packet. Each option number is calculated as a sum of the previous option number and a delta of the current option. The delta and the previous option number are expressed as unsigned 16-bit integers. Due to lack of overflow detection, it is possible to craft a packet that wraps the option number around and results in the same option number being processed again in a single packet. Certain options allocate memory by calling a memory allocation function. In the cases of COAP_OPTION_URI_QUERY, COAP_OPTION_URI_PATH, COAP_OPTION_LOCATION_QUERY, and COAP_OPTION_ETAG, there is no check on whether memory has already been allocated, which in conjunction with the option number integer overflow may lead to multiple assignments of allocated memory to a single pointer. This has been demonstrated to lead to memory leak by buffer orphaning. As a result, the memory is never freed.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2020-06-18 19:15:00","updated_at":"2021-07-21 11:39:00"},"problem_types":["CWE-190","CWE-401"],"metrics":[],"references":[{"url":"https://github.com/ARMmbed/mbed-coap/pull/116","name":"https://github.com/ARMmbed/mbed-coap/pull/116","refsource":"CONFIRM","tags":["Third Party Advisory"],"title":"Bugfix/coap parser mem access bugs by mjurczak · Pull Request #116 · ARMmbed/mbed-coap · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93","name":"https://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93","refsource":"MISC","tags":["Patch","Third Party Advisory"],"title":"Implemented measures to prevent memory leaks in sn_coap_parser_option… · mjurczak/mbed-coap@4647a68 · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/ARMmbed/mbed-os/issues/12957","name":"https://github.com/ARMmbed/mbed-os/issues/12957","refsource":"MISC","tags":["Third Party Advisory"],"title":"Memory leak in MbedOS CoAP library parser - sn_coap_parser_options_parse() · Issue #12957 · ARMmbed/mbed-os · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/ARMmbed/mbed-os/issues/12930","name":"https://github.com/ARMmbed/mbed-os/issues/12930","refsource":"MISC","tags":["Third Party Advisory"],"title":"Integer overflow in MbedOS CoAP library parser · Issue #12930 · ARMmbed/mbed-os · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-12887","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-12887","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2020","cve_id":"12887","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"arm","cpe5":"mbed-coap","cpe6":"5.1.5","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"12887","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"arm","cpe5":"mbed-coap","cpe6":"5.1.5","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"12887","vulnerable":"-1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"arm","cpe5":"mbed_os","cpe6":"5.15.3","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"12887","vulnerable":"0","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"arm","cpe5":"mbed_os","cpe6":"5.15.3","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","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-2020-12887","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":"Memory leaks were discovered in the CoAP library in Arm Mbed OS 5.15.3 when using the Arm mbed-coap library 5.1.5. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse() parses the CoAP option number field of all options present in the input packet. Each option number is calculated as a sum of the previous option number and a delta of the current option. The delta and the previous option number are expressed as unsigned 16-bit integers. Due to lack of overflow detection, it is possible to craft a packet that wraps the option number around and results in the same option number being processed again in a single packet. Certain options allocate memory by calling a memory allocation function. In the cases of COAP_OPTION_URI_QUERY, COAP_OPTION_URI_PATH, COAP_OPTION_LOCATION_QUERY, and COAP_OPTION_ETAG, there is no check on whether memory has already been allocated, which in conjunction with the option number integer overflow may lead to multiple assignments of allocated memory to a single pointer. This has been demonstrated to lead to memory leak by buffer orphaning. As a result, the memory is never freed."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"url":"https://github.com/ARMmbed/mbed-os/issues/12957","refsource":"MISC","name":"https://github.com/ARMmbed/mbed-os/issues/12957"},{"url":"https://github.com/ARMmbed/mbed-os/issues/12930","refsource":"MISC","name":"https://github.com/ARMmbed/mbed-os/issues/12930"},{"url":"https://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93","refsource":"MISC","name":"https://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93"},{"refsource":"CONFIRM","name":"https://github.com/ARMmbed/mbed-coap/pull/116","url":"https://github.com/ARMmbed/mbed-coap/pull/116"}]}},"nvd":{"publishedDate":"2020-06-18 19:15:00","lastModifiedDate":"2021-07-21 11:39:00","problem_types":["CWE-190","CWE-401"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:P","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL","baseScore":5},"severity":"MEDIUM","exploitabilityScore":10,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"AND","children":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:arm:mbed-coap:5.1.5:*:*:*:*:*:*:*","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":false,"cpe23Uri":"cpe:2.3:o:arm:mbed_os:5.15.3:*:*:*:*:*:*:*","cpe_name":[]}]}],"cpe_match":[]}]}},"legacy_mitre":{"record":{"CveYear":"2020","CveId":"12887","Ordinal":"174060","Title":"CVE-2020-12887","CVE":"CVE-2020-12887","Year":"2020"},"notes":[{"CveYear":"2020","CveId":"12887","Ordinal":"1","NoteData":"Memory leaks were discovered in the CoAP library in Arm Mbed OS 5.15.3 when using the Arm mbed-coap library 5.1.5. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse() parses the CoAP option number field of all options present in the input packet. Each option number is calculated as a sum of the previous option number and a delta of the current option. The delta and the previous option number are expressed as unsigned 16-bit integers. Due to lack of overflow detection, it is possible to craft a packet that wraps the option number around and results in the same option number being processed again in a single packet. Certain options allocate memory by calling a memory allocation function. In the cases of COAP_OPTION_URI_QUERY, COAP_OPTION_URI_PATH, COAP_OPTION_LOCATION_QUERY, and COAP_OPTION_ETAG, there is no check on whether memory has already been allocated, which in conjunction with the option number integer overflow may lead to multiple assignments of allocated memory to a single pointer. This has been demonstrated to lead to memory leak by buffer orphaning. As a result, the memory is never freed.","Type":"Description","Title":null},{"CveYear":"2020","CveId":"12887","Ordinal":"2","NoteData":"2020-06-18","Type":"Other","Title":"Published"},{"CveYear":"2020","CveId":"12887","Ordinal":"3","NoteData":"2020-06-18","Type":"Other","Title":"Modified"}]}}}