{"id":"CVE-2020-10071","aliases":["EUVD-2020-2536","GHSA-x73g-qmcm-3qgq"],"status":"published","title":"Insufficient publish message length validation in MQTT","description":"The Zephyr MQTT parsing code performs insufficient checking of the length field on publish messages, allowing a buffer overflow and potentially remote code execution. NCC-ZEP-031 This issue affects: zephyrproject-rtos zephyr version 2.2.0 and later versions.","severity":{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.03395,"percentile":0.88911,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120","CWE-129"],"published":"2020-06-05T17:37:37Z","modified":"2026-06-17T02:47:17Z","products":[{"vendor":"zephyrproject","product":"zephyr"},{"vendor":"zephyrproject-rtos","product":"zephyr"}],"references":[{"url":"https://research.nccgroup.com/2020/05/26/research-report-zephyr-and-mcuboot-security-assessment","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-86","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://docs.zephyrproject.org/latest/security/vulnerabilities.html#cve-2020-10071","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://github.com/zephyrproject-rtos/zephyr/pull/23821/commits/989c4713ba429aa5105fe476b4d629718f3e6082","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-10071"},{"url":"https://github.com/advisories/GHSA-x73g-qmcm-3qgq"}],"sources":{"cve":[{"id":"CVE-2020-10071","title":"Insufficient publish message length validation in MQTT","description":"The Zephyr MQTT parsing code performs insufficient checking of the length field on publish messages, allowing a buffer overflow and potentially remote code execution. NCC-ZEP-031 This issue affects: zephyrproject-rtos zephyr version 2.2.0 and later versions.","status":"published","published":"2020-06-05T17:37:37.515Z","modified":"2024-09-17T04:19:36.893Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-120","CWE-129"],"updated_at":"2026-11-02T14:35:47.877975Z"}],"euvd":[{"id":"EUVD-2020-2536","description":"The Zephyr MQTT parsing code performs insufficient checking of the length field on publish messages, allowing a buffer overflow and potentially remote code execution. NCC-ZEP-031 This issue affects: zephyrproject-rtos zephyr version 2.2.0 and later versions.","status":"published","published":"2020-06-05T17:37:37Z","modified":"2024-09-17T04:19:36Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-03T00:28:23.906788Z"}],"ghsa":[{"id":"GHSA-x73g-qmcm-3qgq","title":"The Zephyr MQTT parsing code performs insufficient checking of the length field on publish...","description":"The Zephyr MQTT parsing code performs insufficient checking of the length field on publish messages, allowing a buffer overflow and potentially remote code execution. NCC-ZEP-031 This issue affects: zephyrproject-rtos zephyr version 2.2.0 and later versions.","status":"published","published":"2022-05-24T17:19:25Z","modified":"2023-01-29T05:02:42Z","updated_at":"2026-11-02T14:45:09.006349Z"}],"nvd":[{"id":"CVE-2020-10071","description":"The Zephyr MQTT parsing code performs insufficient checking of the length field on publish messages, allowing a buffer overflow and potentially remote code execution. NCC-ZEP-031 This issue affects: zephyrproject-rtos zephyr version 2.2.0 and later versions.","status":"published","published":"2020-06-05T18:15:13.087Z","modified":"2026-06-17T02:47:17.957Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-120","CWE-129"],"updated_at":"2026-11-02T14:06:05.962132Z"}]}}