{"api_version":"1","generated_at":"2026-07-14T19:10:39+00:00","cve":"CVE-2020-12884","urls":{"html":"https://cve.report/CVE-2020-12884","api":"https://cve.report/api/cve/CVE-2020-12884.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2020-12884","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-12884"},"summary":{"title":"CVE-2020-12884","description":"A buffer over-read was discovered in the CoAP library in Arm Mbed OS 5.15.3. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse_multiple_options() parses CoAP options that may occur multiple consecutive times in a single packet. While processing the options, packet_data_pptr is accessed after being incremented by option_len without a prior out-of-bounds memory check. The temp_parsed_uri_query_ptr is validated for a correct range, but the range valid for temp_parsed_uri_query_ptr is derived from the amount of allocated heap memory, not the actual input size. Therefore the check of temp_parsed_uri_query_ptr may be insufficient for safe access to the area pointed to by packet_data_pptr. As a result, access to a memory area outside of the intended boundary of the packet buffer is made.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2020-06-18 19:15:00","updated_at":"2020-06-25 14:41:00"},"problem_types":["CWE-125"],"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/ARMmbed/mbed-os/issues/12928","name":"https://github.com/ARMmbed/mbed-os/issues/12928","refsource":"MISC","tags":["Third Party Advisory"],"title":"Out of range memory access in MbedOS CoAP library parser - sn_coap_parser_options_parse_multiple_options · Issue #12928 · ARMmbed/mbed-os · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-12884","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-12884","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2020","cve_id":"12884","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":"12884","vulnerable":"1","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-2020-12884","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":"A buffer over-read was discovered in the CoAP library in Arm Mbed OS 5.15.3. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse_multiple_options() parses CoAP options that may occur multiple consecutive times in a single packet. While processing the options, packet_data_pptr is accessed after being incremented by option_len without a prior out-of-bounds memory check. The temp_parsed_uri_query_ptr is validated for a correct range, but the range valid for temp_parsed_uri_query_ptr is derived from the amount of allocated heap memory, not the actual input size. Therefore the check of temp_parsed_uri_query_ptr may be insufficient for safe access to the area pointed to by packet_data_pptr. As a result, access to a memory area outside of the intended boundary of the packet buffer is made."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"url":"https://github.com/ARMmbed/mbed-os/issues/12928","refsource":"MISC","name":"https://github.com/ARMmbed/mbed-os/issues/12928"},{"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":"2020-06-25 14:41:00","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:arm:mbed_os:5.15.3:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2020","CveId":"12884","Ordinal":"174057","Title":"CVE-2020-12884","CVE":"CVE-2020-12884","Year":"2020"},"notes":[{"CveYear":"2020","CveId":"12884","Ordinal":"1","NoteData":"A buffer over-read was discovered in the CoAP library in Arm Mbed OS 5.15.3. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse_multiple_options() parses CoAP options that may occur multiple consecutive times in a single packet. While processing the options, packet_data_pptr is accessed after being incremented by option_len without a prior out-of-bounds memory check. The temp_parsed_uri_query_ptr is validated for a correct range, but the range valid for temp_parsed_uri_query_ptr is derived from the amount of allocated heap memory, not the actual input size. Therefore the check of temp_parsed_uri_query_ptr may be insufficient for safe access to the area pointed to by packet_data_pptr. As a result, access to a memory area outside of the intended boundary of the packet buffer is made.","Type":"Description","Title":null},{"CveYear":"2020","CveId":"12884","Ordinal":"2","NoteData":"2020-06-18","Type":"Other","Title":"Published"},{"CveYear":"2020","CveId":"12884","Ordinal":"3","NoteData":"2020-06-18","Type":"Other","Title":"Modified"}]}}}