{"id":"CVE-2021-3455","aliases":["EUVD-2021-26778"],"status":"published","title":"Disconnecting L2CAP channel right after invalid ATT request leads freeze","description":"Disconnecting L2CAP channel right after invalid ATT request leads freeze. Zephyr versions \u003e= 2.4.0, \u003e= 2.5.0 contain Use After Free (CWE-416). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7g38-3x9v-v7vp","severity":{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01106,"percentile":0.66057,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-416"],"published":"2021-10-19T22:25:09Z","modified":"2026-06-17T04:05:08Z","products":[{"vendor":"zephyrproject","product":"zephyr"},{"vendor":"zephyrproject-rtos","product":"zephyr"}],"references":[{"url":"http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7g38-3x9v-v7vp","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]}],"sources":{"cve":[{"id":"CVE-2021-3455","title":"Disconnecting L2CAP channel right after invalid ATT request leads freeze","description":"Disconnecting L2CAP channel right after invalid ATT request leads freeze. Zephyr versions \u003e= 2.4.0, \u003e= 2.5.0 contain Use After Free (CWE-416). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7g38-3x9v-v7vp","status":"published","published":"2021-10-19T22:25:09.479Z","modified":"2024-09-16T18:38:53.853Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-26778","description":"Disconnecting L2CAP channel right after invalid ATT request leads freeze. Zephyr versions \u003e= 2.4.0, \u003e= 2.5.0 contain Use After Free (CWE-416). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7g38-3x9v-v7vp","status":"published","published":"2021-10-19T22:25:09Z","modified":"2024-09-16T18:38:53Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-03T00:55:30.637715Z"}],"nvd":[{"id":"CVE-2021-3455","description":"Disconnecting L2CAP channel right after invalid ATT request leads freeze. Zephyr versions \u003e= 2.4.0, \u003e= 2.5.0 contain Use After Free (CWE-416). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7g38-3x9v-v7vp","status":"published","published":"2021-10-19T23:15:07.587Z","modified":"2026-06-17T04:05:08.28Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:07:00.137719Z"}]}}