{"id":"CVE-2020-10062","aliases":["EUVD-2020-2527","GHSA-5rf5-gcg9-hrpr"],"status":"published","title":"Packet length decoding error in MQTT","description":"An off-by-one error in the Zephyr project MQTT packet length decoder can result in memory corruption and possible 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":0.02879,"percentile":0.86943,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-193"],"published":"2020-06-05T17:37:37Z","modified":"2026-06-17T02:47:16Z","products":[{"vendor":"zephyrproject","product":"zephyr"},{"vendor":"zephyrproject-rtos","product":"zephyr"}],"references":[{"url":"https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-84","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://docs.zephyrproject.org/latest/security/vulnerabilities.html#cve-2020-10062","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://github.com/zephyrproject-rtos/zephyr/pull/23821/commits/11b7a37d9a0b438270421b224221d91929843de4","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory"]},{"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://nvd.nist.gov/vuln/detail/CVE-2020-10062"},{"url":"https://github.com/advisories/GHSA-5rf5-gcg9-hrpr"}],"sources":{"cve":[{"id":"CVE-2020-10062","title":"Packet length decoding error in MQTT","description":"An off-by-one error in the Zephyr project MQTT packet length decoder can result in memory corruption and possible remote code execution. NCC-ZEP-031 This issue affects: zephyrproject-rtos zephyr version 2.2.0 and later versions.","status":"published","published":"2020-06-05T17:37:37.262Z","modified":"2024-09-17T00:51:36.14Z","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-193"],"updated_at":"2026-11-02T14:35:48.213211Z"}],"euvd":[{"id":"EUVD-2020-2527","description":"An off-by-one error in the Zephyr project MQTT packet length decoder can result in memory corruption and possible 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":"2024-09-17T00:51:36Z","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":"2026-11-03T00:28:54.932148Z"}],"ghsa":[{"id":"GHSA-5rf5-gcg9-hrpr","title":"An off-by-one error in the Zephyr project MQTT packet length decoder can result in memory...","description":"An off-by-one error in the Zephyr project MQTT packet length decoder can result in memory corruption and possible 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":"2023-01-29T05:02:50Z","updated_at":"2026-11-02T14:45:10.945052Z"}],"nvd":[{"id":"CVE-2020-10062","description":"An off-by-one error in the Zephyr project MQTT packet length decoder can result in memory corruption and possible remote code execution. NCC-ZEP-031 This issue affects: zephyrproject-rtos zephyr version 2.2.0 and later versions.","status":"published","published":"2020-06-05T18:15:12.573Z","modified":"2026-06-17T02:47:16.833Z","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-193"],"updated_at":"2026-11-02T14:06:05.962132Z"}]}}